SUBMERSIBLE PUMP

A submersible pump, comprising a submersible pump housing (9), a motor (2), and a control box (1) which are coaxially arranged. The control box (1) is connected to one end of a motor housing; a submersible pump shaft (91) is provided in the submersible pump housing (9); a connection frame (3) is connected to the other end of the motor housing; the connection frame (3) is hollow; a transmission shaft (31) passes through the connection frame (3); one end of the transmission shaft (31) is connected to a motor shaft fixedly in the circumferential direction and movably in the axial direction, and the other end is in transmission connection with the submersible pump shaft (91); an inward shoulder is provided in the connection frame (3); a protruding outward structure is provided on the peripheral surface of the transmission shaft (31); the outward structure and the motor shaft are respectively arranged at two opposite sides of the inward shoulder; the outward structure and the inward shoulder have an overlap in the