The invention relates to an anti-haze screen window and a preparing method thereof. The anti-haze screen window is made of high polymer materials, titanium dioxide nanoparticles and screen window materials through an electrostatic spinning method. The high polymer materials are one or more of polyvinylidene fluoride, poly methyl methacrylate, thermoplastic polyurethane, polyacrylonitrile and polyethylene terephthalate. According to the anti-haze screen window, the spinning efficiency is high, nano-fiber membranes are uniform and are in close fitting with the screen window, holes are dense, ventilation and breathability are achieved, the screen window can be anti-haze, anti-dust, anti-pollen and anti-mosquito, PM2.5 particulate matters are be effectively blocked, the PM2.5 filtering efficiency reaches more than 99%, clean air effective circulation indoor and outdoor is maintained, and exhaust gas pollution of automobile tail gas is effectively solved. The preparing method of the anti-haze screen window is simple, raw materials are easy to obtain, the cost is low, and scale production is easy.