The invention relates to the technical field of injection molding, in particular to a lifter of an injection mold and the injection mold, wherein the lifter comprises a lifter body, a driving part and a sliding block; the sliding block is arranged on the lifter body and is used for forming a reversing groove of an injection molding part; a slideway extending in the die opening/closing direction of the lifter is arranged on the lifter body; the sliding block is arranged in the slideway in a sliding manner; and the driving part is connected with the sliding block and is used for applying a demolding action force to the sliding block in a direction away from the reversing groove. When the demolding is needed, the driving part applies the demolding action force to the sliding block, so that the sliding block moves to the direction away from the reversing groove of the injection molding part, and then drives the lifter body to be separated from the injection molding part. After the sliding block and the driving part are arranged, the required motion distance of the lifter is reduced, and the interference between the lifter and other structures on the injection molding part does not easily occur, so that the demolding of the lifter is better realized.