The invention provides a protective film, comprising: a protective film layer; a UV (ultraviolet) hard rubber layer combined to the protective film layer; an application UV soft rubber layer combined to the UV hard rubber layer; an application base layer combined to the application UV soft rubber layer; an application viscose layer combined to the application base layer; a release layer combined to the viscose layer; the hardness of the application UV soft rubber layer is <1H. By coating the bottom of the UV hard rubber layer with one UV soft rubber layer, the hardness of an application layer decreases gradually from top to bottom with overall hardness of the application layer decreased; rebound of the protective film is prevented by using memory function of the viscose layer and UV soft rubber layer that are hot-pressed, and shredding of UV face corners is effectively prevented. Experimental results show that the protective film has good hot-pressing performance and has lasting shape performance after being hot-pressed. The invention also provides a preparation method of the protective film.