A sealed communication device for storage tank cleaning mainly solves the problems that when an existing sewage settling tank is cleaned, the environment is polluted, the labor intensity is large, the crude oil recycling rate is low, and safety is poor. The sealed communication device is characterized in that an inner inflation sealing ring (2) and an outer inflation sealing ring (3) are arranged between the inner wall of a tank body (1) and the outer wall of a cleaning hole of the storage tank, and a metal sealing ring (4) is arranged between the inner inflation sealing ring (2) and the outer inflation sealing ring (3); a flange plate of the cleaning hole is connected with a baffle (12) through fixing bolts (5); a dismounting screw (7) is connected to the upper portion of the baffle (12); the fixing bolts (5) and the dismounting screw (7) penetrate through the outer wall of the tank body (1); sealing rubber rings (6) are arranged at the positions, making contact with the tank body (1), of the fixing bolts (5) and the dismounting screw (7); the lower portion of the tank body (1) is connected with a drainage pipe (11) through drainage flanges (10). According to the sealed communication device for storage tank cleaning, sealed discharging of sewage in the sewage settling tank can be achieved, the sewage does not leak, and safety and environment friendliness are achieved.