The invention discloses an injection molding machine which comprises a charging mechanism, an injection device, an injection mold and a cooling device for the injection mold, wherein the injection device comprises a cylinder, a screw rod, a heating mechanism and a nozzle; the nozzle comprises a nozzle body; the nozzle body is provided with a fluid channel; a stepped hole is arranged at the rear end of the nozzle body; the stepped hole of the nozzle body is provided with an internal thread section which is communicated with the fluid channel; an injection filter and a baffle ring are arranged in the stepped hole; the injection filter is provided with an external thread which is matched with the internal thread section of the stepped hole of the nozzle body and a plurality of filter holes which are used for filtering impurities; and the baffle ring is positioned at the rear end of the injection filter. Based on such a structure, the injection molding machine provided by the invention can be used for reducing the load of cleaning work. After an injection mould is placed on a machine table, the injection mould can be conveniently and quickly mounted, thereby reducing the load of mounting work and increasing the production efficiency.