Heavy-load-resistant asphalt pavement modifier as well as preparation method and application thereof

The invention discloses an anti-heavy-load asphalt pavement modifier as well as a preparation method and application thereof. The anti-heavy-load asphalt pavement modifier is prepared from the following raw materials in parts by weight: 100 parts of a polyamide reclaimed material, 5-25 parts of a glycidyl methacrylate copolymer compatilizer, 5-20 parts of waste tire rubber powder, 1-8 parts of a lubricant, 1-5 parts of a silane coupling agent, 1-5 parts of an acid acceptor and 0.1-2 parts of an antioxidant. The heavy-load-resistant asphalt pavement modifier disclosed by the embodiment of the invention has ultrahigh strength and toughness, and after the heavy-load-resistant asphalt pavement modifier is added into an asphalt mixture, not only is the shear strength of the asphalt mixture at high temperature greatly improved, but also the water damage resistance and the fatigue resistance of the asphalt mixture can be obviously improved; the method is of great significance to prevention and treatment of asphalt p