Circumference coupled planet synchronous rotating piston pump

The invention discloses a circumference coupled planet synchronous rotating piston pump. The circumference coupled planet synchronous rotating piston pump comprises a pump body, a secondary rotor A, amain rotor, a front cover plate, a back cover plate, a planet synchronous gear module, an outlet and an inlet; and the main rotor is of a circular structure and provided with a main rotor blade. Through arrangement of the planet synchronous gear module, the wear is lower; a planet wheel of a planet gear continuously moves, so that the engaged positions of the gear of the planet wheel and an outergear ring during each coupling of the main and secondary rotors are different, the wear positions are different, the wear is uniformly distributed on the whole gear module, and the total wear of theplanet synchronous gear module is lower; in a non-coupling state, the main rotor and the secondary rotor are in circumference contact, the peripheral stress of the secondary rotor is zero, and the load of the synchronous gear m