Injection pump

The utility model provides an injection pump, and belongs to the technical field of fluid power pumps. The jet pump solves the problems that an existing jet pump is low in working efficiency and large in noise. The injection pump comprises a pump shell used for being connected with a motor, an impeller and an ejector, a water inlet and a water outlet are formed in the pump shell, a second flow channel is formed in the impeller, the ejector is vertically installed in the pump shell, an installation cavity is formed in the pump shell, and the impeller is embedded in the installation cavity and connected with the output end of the motor. The ejector communicates with an inlet of the second flow channel in the water inlet impeller, a water passing opening communicating with the water outlet is formed in the inner side wall of the mounting cavity, and a first flow channel communicating with the water passing opening and an inlet of the second flow channel in the impeller is formed in the inner side wall of the mou