The invention relates to the field of plastic and molds, in particular to an injection molding machine. According to the injection molding machine, the structure is novel, an injection gun is convenient to replace, and the cost is saved. The injection molding machine comprises a mold locking system and an injection system. The injection system comprises the injection gun and an electronic control system. The injection gun comprises an injection base and a charging barrel. The front end of the charging barrel is provided with one or more nozzles. A wheel disc is arranged between the nozzles and the charging barrel. The nozzles are evenly distributed on the wheel disc. According to the design of the injection molding machine, the multiple nozzles are adopted, and the multiple nozzles are communicated with the wheel disc and are connected with the end of the charging barrel through a flange. In normal use, even if one of the nozzles is blocked or damaged, the other nozzles can be utilized for working, when all nozzles are blocked or damaged, workers only need to disassemble the wheel disc and the nozzles in an integral mode, a new wheel disc and new nozzles can be replaced, and the cost is saved.