Draining pump and washing device formed by same

The drainage pump comprises an impeller pump body, the impeller pump body comprises a pump head body, a drainage cavity is formed in the pump head body, a water inlet and a water outlet which are communicated with the drainage cavity are formed in the pump head body, and a motor used for driving the impeller pump body to pump water is arranged on one side of the pump head body. An emptying structure communicated with the drainage cavity is integrated at the bottom end of the pump head body, the emptying structure is located below the drainage cavity, and the output end of the motor is provided with a driving assembly for driving the emptying structure to drain residual liquid in the drainage cavity. According to the impeller pump, no sewage is deposited in the impeller pump body, the risk that water quality is deteriorated and peculiar smell is generated due to long-time deposition of the sewage is avoided, a washing device composed of the impeller pump body cannot be polluted, and the living environment cann