Underwater pre-embedded sealing sleeve for sewage pool

The utility model discloses an underwater pre-embedded sealing sleeve for a sewage pool, which comprises a sleeve body and a mounting hole, a baffle plate is arranged on the end side of the sleeve body, a first sealing ring is mounted on the inner side of the baffle plate, a plug is fixed in the middle of the first sealing ring, a second sealing ring is mounted at the bottom of the plug, and the mounting hole is formed in the second sealing ring. A connecting rod is arranged in the middle of the plug, a nut is installed on the outer side of the connecting rod, a support is fixed to the end face of the baffle, a limiting rod is arranged in the middle of the support, and a spring is installed on the outer side of the limiting rod. The casing pipe body is sealed through the baffle and the plug, the inner wall of the casing pipe body is conveniently protected, sundries are prevented from damaging the inner wall of the casing pipe body, meanwhile, the positioning rod is fixed to the outer side of the fixing rod by