The present invention relates to a multi-color injection molding machine, in which two or more measuring cylinders are provided with a rotating shaft with a transfer screw for transporting the injection liquid, and injection liquid supplied from the measuring cylinder through an injection passage by perturbation of a piston. It characterized in that it consists of an injection cylinder formed with an injection hole for injection. In addition, the piston is composed of a body having a head and a hollow portion, and is inserted into the hollow portion of the piston body and further provided with an elastic means for buffering the head and the body, and the injection passage is supplied to the injection cylinder. It is characterized in that it is formed to contact the injection cylinder at a predetermined angle in the same rotational direction so that vortex is generated and mixed with the liquid. Accordingly, it is possible to form a product of various colors desired by forming and injecting a mixed-colored injection product of simple and precise color, and the molten resin is immediately inserted into the injection passage by the opening and closing device while the molten resin is filled up to the transfer path. Since it can be injected, there is an advantage that the work process can be performed quickly, and mixing of the injection liquid is prevented by discharging all the injection liquid remaining in the injection cylinder, thereby minimizing the defect rate of the product. In addition, the impact that may occur when the piston of the injection cylinder is operated is prevented. It is possible to prevent damage to the injection cylinder and the piston by absorbing it by the buffering action of the elastic means, and it is possible to pressurize the piston of the auxiliary injector, so that a small amount of molten resin can be injected.
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