The invention discloses a production process for un-stretched polypropylene film used in laser false proof. The technology adopts multilayer co-extrusion technology using a main extruding machine and two subsidiary machines, comprises the following steps: selecting main and auxiliary materials and premixing the materials in high speed, loading materials, three-layer melting and extruding, interlayer distributing, cooling and shaping, measuring thickness and adjusting, corona treating, winding, testing products, cutting and packaging; wherein the mass ratio is: main material on the main extruding machine: the auxiliary material on the subsidiary machine 1: the auxiliary material on the subsidiary machine 2 = 95:5:5, and the main material and the auxiliary materials are respectively mixed, and then stirred for 5 minutes. The invention solves problems of poor obstructing performance, relatively high oxygen transmittance and insufficient rigidity of material existing in present CPP and BOPP films in our country; thereby, can prolong the shelf life of packing. and the film of the present invention achieves the advantages of good thermal stability performance, excellent aluminizing performance, excellent thermal sealing performance, excellent physical properties, high glossiness and good haze performance, excellent laser false proof manufacturing effect, and high yield rate.