The present invention discloses a solar cell silicon wafer cleaning method and a solar cell preparation method. The cleaning method comprises: performing precleaning of the solar cell silicon wafer to allow the surface of the solar cell silicon wafer to generate oxidation; and employing the mixed solution of hydrofluoric acid, hydrogen peroxide and hydrochloric acid to perform etching cleaning of the solar cell silicon wafer after precleaning. According to the embodiment of the invention, on the basis of the micro-etch effect on the solar cell silicon wafer through adoption of the hydrofluoric acid and the hydrogen peroxide, the residual metal ions can be dissolved through addition of the complexing action of the hydrochloric acid on the metal ions to further enhance the cleaning effect on the metal pollutant at the surface of the solar cell silicon wafer so as to reduce the recombination of the metal ions at the surface of the solar cell silicon wafer and the minority carriers in the solar cell silicon wafer, improve the lives of the minority carriers in the solar cell silicon wafer and improve the efficiency of the solar cell.