Pump body structure of oral irrigator and oral irrigator

The water pick pump body structure comprises a pump body, a sealing sleeve and a transmission rod, one end of the sealing sleeve is arranged in an opening of the pump body in a sleeved mode, the other end of the sealing sleeve is fixedly connected with the top end of the transmission rod, and the end, away from the sealing sleeve, of the transmission rod is connected with a power mechanism. The end, away from the sealing sleeve, of the opening of the pump body is communicated with a backflow guide pipe, a backflow valve is arranged on the side face of the pump body and communicated with the side wall of the backflow guide pipe, the opening of the backflow valve is communicated with a water inlet pipe, and a flow limiting piece is arranged between the water inlet pipe and the backflow valve. A piston is replaced by the sealing sleeve, the sealing sleeve is extruded and stretched to be matched with the return valve and the flow limiting piece to enable the water pump to generate strong thrust and suction force,