Environment-friendly multi-functional agricultural soil surface nutrient film and preparation method thereof

The invention relates to an environment-friendly multi-functional agricultural soil surface nutrient film and a preparation method thereof. The environment-friendly multi-functional agricultural soil surface nutrient film consists of the following components in percentage by weight: 55 to 70 percent of mark asphalt, 0.5 to 0.8 percent of polymeric emulsifier and 22.5 to 44.2 percent of water; andthe preparation method for the environment-friendly multi-functional agricultural soil surface nutrient film comprises the following steps of: 1) heating the mark asphalt in an asphalt heating barrelof an emulsifying machine to the temperature of between 130 and 170DEG C; 2) heating liquid soap prepared by mixing the polymeric emulsifier and the water in an emulsifier heating barrel of the emulsifying machine to the temperature of between 85 and 120DEG C, and regulating the pH value to be 7.5-9.0; 3) fully mixing the asphalt and the liquid soap by using a high speed pump of the emulsifying machine, and preparing film