Stable submerged pump structure

The utility model relates to the technical field of submerged pumps, and discloses a stable submerged pump structure which effectively solves the problems that the inner diameter of an existing annular block is not easy to adjust, and pump shafts with different diameters are not easy to limit, the stable submerged pump structure comprises a pipeline, a water inlet pipe is installed on one side of the pipeline, and a water outlet pipe is installed on the other side of the pipeline. A top cylinder is installed at the top end of the pipeline, a motor is installed at the top end of the top cylinder, a pump shaft is installed on an output shaft of the motor, and the pump shaft is inserted into the top cylinder and the pipeline. One ends of the multiple limiting plates make contact with the inner side wall of the outer ring groove, so that the pump shaft is limited, pump shafts with different diameters are conveniently limited, meanwhile, balls on universal wheels on the upper side and the lower side of one end of