The invention discloses a method for adhering static electricity to the surface of a non-woven fabric by a flash evaporation method. The method comprises the following steps: 1, preparing a spinning stock solution, wherein the spinning stock solution is prepared by evenly mixing and adding a polymer, a spinning solvent and dimethylformamide into a high-pressure reaction kettle; 2, spraying the spinning stock solution out of a spinning nozzle of a flash spinning device to form fiber bundles, high-pressure air carrying the fiber bundles is guided to an electrostatic fiber splitting device by a steering plate, the high-pressure air with the fiber bundles is uniformly split into a net-shaped fluffy structure through the electrostatic fiber splitting device, the fiber bundles after splitting settle on an accumulation belt to form fiber webs, and the fiber webs are subjected to hot rolling of a roller to form sheets. According to the method, the dimethylformamide is added into the spinning stock solution for the first time, so that the capacity of static electricity adhesion to the surface of the non-woven fabric made by the flash evaporation method is enhanced, the dispersion performance of finished fibers is greatly improved, and meanwhile, the mechanical property of the non-woven fabric made by the flash evaporation method is improved.