Self-sealing water seal floor drain

The utility model provides an automatic sealing water seal floor drain. The automatic sealing water seal floor drain comprises a floor drain inner core, a first permanent magnet, a second permanent magnet and a floor drain cover plate, the top end of the floor drain inner core is provided with the floor drain cover plate and forms a cavity with the floor drain cover plate; the first permanent magnet is fixedly mounted in the cavity, and the second permanent magnet is mounted in the cavity in a sliding manner; the second permanent magnet and the first permanent magnet have magnetic attraction force and form sealing; when liquid is injected into the floor drain inner core and the gravity of the liquid is greater than the magnetic attraction force, the second permanent magnet and the first permanent magnet are separated and are not sealed any more, and the liquid is discharged out of the floor drain inner core; and when the liquid part is discharged and the gravity of the residual liquid is smaller than the magn