The invention provides a bevel-edge-shaped-tooth-top serrated knife type preservative film using device, relates to preservative film using devices, and aims to solve the problem of unsafety due to the fact that existing preservative films are drawn from cartons and then placed on racks on the cartons to be forcedly snapped when in use and the problems of difficulty in cutting of the preservative films and inconvenience in drawing of the preservative films during actual use. The bevel-edge-shaped-tooth-top serrated knife type preservative film using device comprises a knife rest, a knife holder, a gripper and an opener. The knife rest is fixed on the lower side of the front end of the upper portion of the opener, and the knife holder is fixed on the upper side of the front end of the lower portion of the opener. A preservative film extends out of an outlet in the middle of the opener, forwards passes the upper side of the knife holder and the lower side of the knife rest and is drawn out of the device. The knife edge is formed by arrangement of tooth tops with bevel edges and straight edges, the serrated knife with one end high and the other end low is oblique, assistant cutting blocks are arrayed in a same oblique mode, the tooth tops are not lower than assistant cutting points, and the sheet-shaped gripper is fixed on the lower side of the upper portion of the opener.