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 rotor core, the rotor core comprises a rotor yoke and a plurality of rotor teeth arranged on the periphery of the rotor yoke, and a mounting groove is formed between every two adjacent rotor teeth and the rotor yoke; wherein the mounting grooves are internally provided with supporting convex parts, the supporting convex parts are provided with first ends abutting against the permanent magnets located in the mounting grooves and second ends connected with the rotor yoke in the radial direction of the rotor iron core, the supporting convex parts are arranged in a manner of gradually shrinking towards the permanent magnets, the width of the first ends is A1, the width of the permanent magnets is A3, and A3/A1 is larger than or equal to 5 and smaller than 8; the sum Q1 of the areas of the permanent magnets and the area Q2 of the rotor iron core meet the condition that Q1/Q2 is larger than or equal to 0.45 and smaller than or equal to 0.65; according to the technical scheme provided by the invention, the weight of the rotor can be reduced, and meanwhile, the magnet filling rate is improved to improve the performance of the motor.