The invention belongs to the technical field of decoration films, and provides a toughened scratching-resistant metal simulating decoration film and a preparing method. According to the method, transparent polyethylene materials, erucyl amide powder and nano silicon dioxide serve as upper-layer raw materials, resin, metal powder pigment and a dispersing agent serve as low-layer raw materials, double-layer hot melting extrusion is conducted, an electronic accelerator is used for irradiating a polyethylene layer, and the scratching-resistant metal simulating decoration film is prepared. Comparedwith a traditional method, through the prepared metal simulating decoration film, a polyethylene molecular chain and nano silicon dioxide particles are crosslinked and entangled, nano silicon dioxidedispersion is uniform, the mechanical performance of the obtained film is good, the film surface-layer hardness is high, and the surface scratching resisting performance of the metal simulating filmis obviously improved; and meanwhile, the technology is simple, usage of a harmful bonding agent is not needed, environment friendliness is good, the usage performance is good, the metal simulating effect is excellent, and the application range is wide.