Photovoltaic cells as an important part of the national "dual carbon strategy", the improvement of its conversion efficiency is of great significance. Aiming at the invalid conversion area of crystalline silicon and other solar cells, this paper designs and prepares microstructure light-enhanced films based on the principle of total reflection. The microstructure of the film is triangular groove orthogonal grating with period and groove depth of 80 μm. The test results of photovoltaic cell modules fitted with thin film samples show that the conversion efficiency of the three groups of modules is increased by more than 2%. Compared with other methods to improve the efficiency of photovoltaic cells, this method is simple and feasible, and is expected to be widely used in photovoltaic cell modules, and contribute to our country′s "dual carbon strategy".