The invention discloses a vane pump suitable for an injection molding machine. The vane pump comprises a pump body, a transmission shaft is arranged in the pump body, the transmission shaft is sleeved with a rotor, a stator is arranged outside the rotor, vane grooves are formed in the rotor, vanes are evenly distributed between the rotor and the stator, and the vanes are located in the vane grooves. Oil distribution discs are arranged on the two sides of the rotor, and comprise an oil suction distribution disc and an oil pressing distribution disc located on the two sides of the rotor, an oil cavity is formed among the rotor, the stator, the vanes and the oil distribution discs, and lubricating oil holes are formed in the vane grooves, and are close to one side of the oil cavity. The vane pump is simple in structure, the continuity of oil films on the surfaces of the vanes is increased, abrasion of the vanes and the vane grooves is reduced, noise is lowered, and a pump biting phenomenon is not likely to happen. The technical problems that in the prior art, a vane pump is poor in lubricating effect, the continuity of oil films formed on vanes is poor, and consequently abrasion of the vanes and vane grooves is accelerated are solved.