The invention discloses a high-power diesel engine cylinder sleeve surface functional phosphating technology. The technology is carried out according to the following processes: hanging, alkaline chemical oil removal, flowing cold water washing, acid washing, flowing cold water washing, activation, phosphating, recycling, flowing cold water washing, hot water washing, drying and acceptance inspection, so that a phosphating film is generated on the surface of a cylinder sleeve. According to the invention, besides the corrosion resistance of the phosphating film, the non-metal phosphating film layer is generated between a cylinder sleeve and a piston ring, the attraction between molecules is reduced, the friction coefficient is reduced, and the purposes of shortening the running-in time and reducing cylinder scoring accidents are achieved. Meanwhile, after the phosphating film is abraded, the thickness of a lubricating oil film is ensured by utilizing the small corrosion holes regularly distributed on the working surface of the inner wall of the cylinder sleeve, the anti-friction performance is continuously exerted, and the effect of prolonging the service life of the cylinder sleeve is achieved.