Booster pump

The invention discloses a booster pump and relates to the technical field of booster pumps, the booster pump comprises a pump head and a motor, the motor comprises a stator and a rotor, the stator is connected to the pump head, the rotor comprises a rotor iron core, a permanent magnet and a rotating shaft, the rotating shaft is installed in the rotor iron core, and the rotor iron core is rotationally connected into the stator through the rotating shaft; the rotor core comprises a rotor yoke, a plurality of rotor teeth and a plurality of magnetic bridges, the plurality of magnetic bridges are arranged on the peripheral surface of the rotor yoke at intervals, the rotor teeth are connected to the rotor yoke through the magnetic bridges, one rotor tooth is arranged corresponding to one magnetic bridge, a mounting groove is formed between every two adjacent rotor teeth, the peripheral surface of the rotor yoke is provided with a supporting bulge, and the permanent magnets are mounted in the mounting grooves. The length of the rotor iron core in the axial direction is Z1, the length of the permanent magnets in the radial direction of the rotor iron core is L1, and Z1/L1 is larger than or equal to 1.5 and smaller than or equal to 2.5. According to the technical scheme, the axial size of the motor is reduced, and the efficiency of the motor and the booster pump is improved.