The utility model discloses an injection screw structure of a polyethylene blowing and foaming forming machine, which belongs to the field of shoemaking and shoemaking equipment. The injection screw structure of a polyethylene blowing and foaming forming machine comprises a framework, injection charging barrels, an injection head and mounting screw nails, the injection head is a multi-screw injection head, which is a structure formed by abutting a plurality of single injection heads together and fixedly connecting the single injection heads via mounting screws, or a plurality of injection openings in an identical injection head are respectively connected with different injection charging barrels, and the injection screws are located in the injection charging barrels. The utility model increases the working efficiency of the polyethylene blowing and foaming forming machine, increases the product quality of the polyethylene blowing and foaming forming machine, resolves the problems of material waste and effect loss caused by the multi-station type that one machine is equipped with one screw of the traditional polyethylene blowing and foaming forming machine, and achieves the purpose of that one machine is in multi-color and multi-component-material injection.