diff --git a/dtable_events/app/app.py b/dtable_events/app/app.py
index 65c1b1fe..9b4092ab 100644
--- a/dtable_events/app/app.py
+++ b/dtable_events/app/app.py
@@ -8,6 +8,7 @@
 from dtable_events.tasks.instant_notices_sender import InstantNoticeSender
 from dtable_events.tasks.email_notices_sender import EmailNoticesSender
 from dtable_events.tasks.dtables_cleaner import DTablesCleaner
+from dtable_events.tasks.seadb_databases_cleaner import SeaDBDatabasesCleaner
 from dtable_events.tasks.dtable_updates_sender import DTableUpdatesSender
 from dtable_events.tasks.dtable_real_time_rows_counter import DTableRealTimeRowsCounter
 from dtable_events.tasks.ldap_syncer import LDAPSyncer
@@ -66,6 +67,7 @@ def __init__(self, task_mode):
             self._instant_notices_sender = InstantNoticeSender()
             self._email_notices_sender = EmailNoticesSender()
             self._dtables_cleaner = DTablesCleaner()
+            self._seadb_databases_cleaner = SeaDBDatabasesCleaner()
             self._dtable_updates_sender = DTableUpdatesSender()
             self._dtable_notification_rules_scanner = DTableNofiticationRulesScanner()
             self._ldap_syncer = LDAPSyncer()
@@ -105,6 +107,7 @@ def serve_forever(self):
             self._instant_notices_sender.start()             # default True
             self._email_notices_sender.start()               # default True
             self._dtables_cleaner.start()                    # default True
+            self._seadb_databases_cleaner.start()            # default True
             self._dtable_updates_sender.start()              # default True
             self._dtable_notification_rules_scanner.start()  # default True
             self._ldap_syncer.start()                        # default False
diff --git a/dtable_events/tasks/seadb_databases_cleaner.py b/dtable_events/tasks/seadb_databases_cleaner.py
new file mode 100644
index 00000000..9b6abae0
--- /dev/null
+++ b/dtable_events/tasks/seadb_databases_cleaner.py
@@ -0,0 +1,73 @@
+import os
+import logging
+from threading import Thread, Event
+
+from dtable_events.utils import get_python_executable, run
+from dtable_events.app.config import dtable_web_dir, TRASH_CLEAN_AFTER_DAYS
+
+__all__ = [
+    'SeaDBDatabasesCleaner',
+]
+
+
+class SeaDBDatabasesCleaner(object):
+
+    def __init__(self):
+        self._enabled = True
+        self._logfile = None
+        self._interval = 60 * 60 * 24
+        self._prepare_logfile()
+        self._parse_config()
+
+    def _prepare_logfile(self):
+        logdir = os.path.join(os.environ.get('LOG_DIR', ''))
+        self._logfile = os.path.join(logdir, 'seadb_databases_cleaner.log')
+
+    def _parse_config(self):
+        self._expire_seconds = 60 * 60 * 24 * TRASH_CLEAN_AFTER_DAYS
+
+    def start(self):
+        if not self.is_enabled():
+            logging.warning('Can not start seadb databases cleaner: it is not enabled!')
+            return
+
+        logging.info('Start seadb databases cleaner, interval = %s sec', self._interval)
+
+        SeaDBDatabasesCleanerTimer(self._interval, self._logfile, self._expire_seconds).start()
+
+    def is_enabled(self):
+        return self._enabled
+
+
+class SeaDBDatabasesCleanerTimer(Thread):
+
+    def __init__(self, interval, logfile,
+                expire_seconds=30*60):
+        super(SeaDBDatabasesCleanerTimer, self).__init__()
+        self._interval = interval
+        self._logfile = logfile
+        self._expire_seconds = expire_seconds
+
+        self.finished = Event()
+
+    def run(self):
+        while not self.finished.is_set():
+            self.finished.wait(self._interval)
+            if not self.finished.is_set():
+                logging.info('Starts to clean trash seadb databases...')
+                try:
+                    python_exec = get_python_executable()
+                    manage_py = os.path.join(dtable_web_dir, 'manage.py')
+                    cmd = [
+                        python_exec,
+                        manage_py,
+                        'clean_trash_seadb_databases',
+                        self._expire_seconds,
+                    ]
+                    with open(self._logfile, 'a') as fp:
+                        run(cmd, cwd=dtable_web_dir, output=fp)
+                except Exception as e:
+                    logging.exception('error when cleaning trash seadb databases: %s', e)
+
+    def cancel(self):
+        self.finished.set()