Injection molding machine capable of realizing accurate mold closing and positioning without damaging mold

The utility model discloses an injection molding machine capable of accurately closing and positioning a mold without damaging the mold. The injection molding machine comprises a rack, an injection mechanism, a mold closing mechanism and a positioning mechanism, the injection mechanism is arranged on the rack; the mold closing mechanism comprises a fixed mold, a movable driving device and a movable mold; the fixed mold, the movable driving device and the movable mold are all arranged on the rack; the fixed mold is communicated with an injection port of the injection mechanism; the movable mold is in transmission connection with the driving end of the movable driving device; the positioning mechanism comprises a first mold closing block and a second mold closing block; the first mold closing block is arranged on the fixed mold; a positioning groove is formed in the first mold closing block; rolling beads are rotationally arranged on the side walls of the positioning grooves; a pressure buffering spring is arra