A method for prepare a photovoltaic polycrystalline cell includes clean polycrystalline silicon wafer, fleece making, diffusion junction making and wet etching. The polycrystalline silicon wafer afterwet etching is put into a thermal oxidation equipment for preparation to form an oxide film on the surface of the polycrystalline silicon wafer; A multilayer antireflection film is deposited on the basis of the oxide film formed in the previous step by using a coating device; Carrying out printing electrode and sintering treatment on the polycrystalline silicon wafer obtained in the previous step, and preparing a photovoltaic polycrystalline cell wafer; Processing the photovoltaic polycrystalline cell sheet prepared in the previous step by an electric injection device; The photovoltaic polycrystalline cell after electric injection was tested for its electric performance efficiency and light attenuation data. The invention has the characteristics that the conversion efficiency of the photovoltaic polycrystalline battery can be improved.