Booster pump

The invention discloses a booster pump, and relates to the technical field of booster pumps, the booster pump comprises a mounting bracket, a motor, an eccentric wheel, a piston valve seat, a pump head, a diaphragm and a piston push block, the eccentric wheel is in transmission connection with the motor, the piston valve seat is in transmission connection with the eccentric wheel, the pump head is provided with a water inlet and a water outlet, and the diaphragm is mounted on one side, facing the motor, of the pump head; the water inlet and the water outlet are both communicated with the booster pump, a mounting through hole is formed in the diaphragm, and the piston push block penetrates through the mounting through hole through a connecting piece to be connected to the piston valve seat. At least one of the sides, facing each other, of the piston push block and the diaphragm is provided with a first annular rib, and at least one of the sides, facing each other, of the piston valve seat and the diaphragm is provided with a second annular rib. The technical scheme provided by the invention has the technical effect.