The invention discloses an acid texturing liquid used for etching a solar battery silicon wafer, a texturing method, a solar battery piece and a manufacturing method thereof. The acid texturing liquidcomprises a copper ion source used for providing copper ions at the concentration of 20-150.0 mmol / L, a fluorine ion source used for providing fluorine ions at the concentration of 0.5-10.0 mol / L andan oxidizing agent at the concentration of 0.2-2.0 mol / L for oxidizing copper into copper ions. By adoption of the acid texturing liquid, the silicon wafer surface can be well textured, so that an independent, complete and tightly arranged inverted pyramid structure can be formed on the silicon wafer surface at the room temperature within extremely short time; by virtue of the structure, the reflectivity of incident light on the textured surface can be lowered to 4-12%, so that the solar battery efficiency is improved; and by adoption of the acid texturing liquid and the texturing method, production cost can be lowered, the reaction temperature can be lowered, the reaction time can be shortened, and production yield can be increased.