High-efficiency water delivery multi-stage fire pump

The invention belongs to the technical field of fire fighting equipment, and particularly relates to a high-efficiency water delivery multi-stage fire pump. The multi-stage fire pump comprises a supporting plate, a motor and connecting rings; a base is fixedly connected to the upper side of the supporting plate at the bottom; the motor is fixedly connected to the upper surface of the supporting plate at the top; one side, close to the motor, of the base is fixedly connected with the connecting rings; the plurality of connecting rings matched with the base are mutually combined with the top supporting plate to form a pressurizing cavity; a first cavity is formed in the base; a motor output shaft penetrates through the supporting plate, a shell and the base and extends into the first cavity;one end, located in the first cavity, of the motor output shaft is fixedly connected with a first cam; and a second cam is rotationally connected to one side, located on the first cam, of the first cavity. According to the h