The utility model discloses a triangle rotor type delivery pump, wherein, a rotor (2) is arranged in a pump casing (1), the pump casing (1) adopts a cylindrical cavity, a feed opening (1a) and a discharge opening (1b) communicated with the inner chamber of the pump casing are formed separately on the outer circumferential surface of the pump casing (1), the cross section of the rotor (2) approximates to a triangle in shape, three edges of the triangle are outwardly-convex arcs, the rotor (2) is arranged in an eccentric manner in the pump casing (1), the center lines of the rotor (2) and the pump casing (1) are parallel to each other, a partition board stretching piece (3) is installed at each interior angle of the rotor (2), the rotor (2) is driven by a driving shaft to rotate around the center of the rotor (2), and the partition board stretching piece (3) are in permanent contact with the inner wall of the pump casing (1) so as to deliver materials entering through the feed opening (1a) to the discharge opening (1b) for extrusion. In addition to the advantage of simple structure, the utility model, when in use, is capable of high pressure delivery without interruption, and ensures little noise, flexible pressure regulation and high power efficiency during the whole delivery process.