The invention discloses a double acting multi-vane pump. The double acting multi-vane pump comprises a shell body, a rotor, blades and a sliding boot, the rotor is covered with the shell body, and a round of ring K1 extends in the center of the inner wall of the shell body to the direction of center of a ball; a ring groove is formed in the center of the side wall of the rotor, at least three leftsliding grooves distributed evenly in the circumferential direction are formed in the left side surface of the ring groove, right sliding grooves with the same number of the left sliding grooves andcorresponding to the left sliding grooves one by one are formed in the right side surface of the ring groove, and the blades are slidably arranged on the left sliding grooves and the right sliding grooves; the ring K1 is clamped between the blades of the left sliding grooves and the right sliding grooves, the outer end heads of the blades are installed on the sliding boot, and the sliding boot isconnected with the side surface of the ring K1 in an abutting mode; the adjacent two blades, the surface of the ring groove, the inner wall of the shell body and the side wall of the ring K1 form an accommodating cavity; and the axial of the rotor and the axial of the shell body do not coincide. According to the double acting multi-vane pump, the relative linear speed between the blades and the shell body is very small, running at a very high speed can be achieved, the volume is very small, the displacement is very large, and the output pressure is very high.