Dual host, double head, double composite roller structure of the unit, with polyethylene or polypropylene as raw material, the extrusion molding with different substrates such as plastic woven cloth, cloth, paper, metal foil substrate double-sided Fumo completed in a production process, especially suitable for plastic woven cylindrical bag as substrate, and BOPP color film by extrusion composite production of single-sided or double-sided color film composite plastic woven bag. Compared with the single host, single head plastic laminating unit, the unit in a production process to complete the double-sided laminating material, production efficiency can be increased one times, reduced energy consumption, labor saving, and reduce the production of waste may, provided a guarantee for the quality of the products.