To improve the anti-friction and anti-scratch ability of the mobile phone display screen and reduce the risk of display screen breakage, a hard antireflection film in visible light band has been prepared in this paper. By gradually increasing the proportion of the thickness of the Si_xN_y film in the total thickness, the deposition process is optimized and the film hardness is improved. According to the design theory of antireflection coating, reasonable film grouping mode and reverse inversion analysis method, the film system design is completed, and the reflectivity of the film is reduced. Testing results show that the average reflectivity of the film is 0.58% and the hardness is 15.99 GPa.