The utility model discloses a temperature control device of an injection molding machine. The temperature control device comprises a machine body, a shooting base, a discharge pipe, a screw and a drive motor, wherein the screw is arranged inside the discharge pipe and connected with the drive motor in a matching manner; a blanking device is vertically arranged on the shooting base, and communicated with the discharge pipe by virtue of a blanking hole on the shooting base; a temperature sensor is arranged on the lateral wall of the shooting base; at least one group of electric heating coils are sleeved on the discharge pipe; a cooling jacket is arranged on the discharge pipe; the lower part of the cooling jacket is connected with an intake pipe; the upper part is connected with a discharge pipe; a control valve is arranged on the intake pipe; the temperature sensor, the electric heating coils and the control valve are respectively connected with the control device. The temperature control device has the advantages that the temperature control device is simple in structure and convenient to use, the temperature of a blanking opening is detected by using the temperature sensor, and transferred to the control device; the electric heating coils and the control valve on the cooling jacket are controlled by virtue of the control device, so that the electric heating coils are coordinated with the cooling jacket to adjust the temperature of the raw material.