The utility model discloses a polyvinylidene fluoride film, film comprise with outer bilayer structure the inlayer from bottom to top in proper order, the inlayer is toughening layer, the outer polyvinylidene fluoride layer that is adopts the preparation of thermoplastic multilayer hydrostomia coextrusion or multilayer blown film coextrusion method to obtain. The utility model provides an among the polyvinylidene fluoride film, the inlayer is modified through toughening agent for thin film mold has better toughness, the skin is polyvinylidene fluoride, does not contain PMMA and other inorganic filler, makes thin film mold have excellent weatherability and steam separation nature, the effective shortcoming that must overcome the monofilm.