NOVELTY - An etching auxiliary agent of fabric for single crystal silicon wafer, comprises one of phenylcarbinol, triethanolamine and water, where the water is deionized water. The volume percentage of alcohol is 1-3% and the volume percentage content of the triethanolamine is 0.5-5%.    USE - As etching auxiliary agent of fabric for single crystal silicon wafer; for preparing flocking alkaline agent used in the manufacture of solar battery and solar cell (claimed).    ADVANTAGE - The etching agent adds the alkali liquid in large scale etching process and achieves good etching effect. The etching has no assistant toxicity, no corrosion, is non-irritant, non-combustion and does not show explosion danger, and is non-harmful to human body and environment. The manufacture of solar battery using the agent is simple, the equipment is low and the repeatability is good. The solar battery achieves good etching effect. The etching auxiliary agent is high boiling point agent. The solar battery manufacturing method carried out using the agent has no volatilization, reduces the production cost and is convenient to operate as compared to the standard etching process. The auxiliary agent does not use isopropanol or ethanol. The etching agent reduces organic matter by at least some number magnitude, which greatly reduces chemical oxygen demand value of the residual liquid after etching, even reach the national sewage discharge standard, does not pollute environment and reduces the waste liquid processing cost. The method improves the yield of the battery sheet; increases the fill factor of the cell and improves the photoelectric conversion efficiency of the solar battery sheet.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) preparing flocking alkaline agent involving placing the etching auxiliary agent for mono-crystalline silicon piece in any one of wool and alkali solution, where the volume ratio of the etching auxiliary agent and the alkali liquor is 0.5 to 3:100 and the alkali liquor is present in an amount of 0.8-2. The aqueous solution comprises sodium hydroxide or potassium hydroxide. The alkali solution is sodium hydroxide or potassium hydroxide deionized water solution with concentration of 8-20 wt.%; and    (2) manufacturing solar battery by single crystal silicon wafer etching method involving: etching auxiliary agent; adding the etched agent to alkali solution to obtain alkaline flocking agent; and using the alkaline flocking agent for mono-crystalline silicon piece surface wool for solar battery to obtain good etching. The alkali solution is sodium hydroxide or potassium hydroxide water solution or is sodium hydroxide or potassium hydroxide deionized water solution. After etching, the silicon chip whole surface color to form the pyramid is uniformly covered on the surface of the silicon sheet, where the size is 1-5 microns.