The present invention discloses acid corrosion solution for preparing polycrystalline silicon pile surface and its usage. The solution is compounded with oxidant and hydrofluoric acid and through mixing, and the oxidant is nitrate or nitrite. During use, the cut polycrystalline silicon chip is set inside the corrosion solution for corrosion at the temperature of -10 to +25 deg.c for 0.5-20 min to eliminate damage surface caused by wire electrode cutting, with the acid corrosion time and temperature being dependent on the solution concentration. The present invention is suitable for both intermittent production and continuous production, and has easy treatment of the produced waste acid.