The invention discloses a blanking plug rear end cover injection mould which comprises a fixed mould, a movable mould, a feed inlet, and a cooling water channel; a guide sleeve is mounted on a fixed mould plate of the fixed mould; a movable guide post is inserted in the guide sleeve; the guide post is fixed on a movable mould plate of the movable mould; the movable mould performs opening-closing movement through the guide post; four moulding cavities are formed by corresponding engaging of the movable mould and the fixed mould; the four moulding cavities are symmetrically arranged in a rectangle; each moulding cavity is a cylindrical middle-hole cavity with a cone-shaped upper end; six evenly divided grooves are disposed on the upper end cone-shaped cavity wall of each moulding cavity; the evenly divided grooves extend to the cylindrical middle-hole cavity wall from the cone-shaped cavity wall. With the above mode, the blanking plug rear end cover is moulded rapidly; four blanking plug rear end covers can be processed at one time; the production efficiency of plastic moulds is improved; the yield is increased; the production cost is decreased; and resource waste is prevented.