The invention discloses a method for making in-machine coated water transfer base paper, comprising the stations such as a pulp preparation station, a wetting system, a twin wire paper machine, a pre-drying station, a surface gluing station, a post-drying station, a coating station and a reel-cutting station; coated water transfer base paper is produced directly on the twin wire paper machine that is high in speed and yield, the yield is up to higher than 3000 tons per day which is far higher than that of a present domestic common fourdrinier that has a daily capacity of 200 tons per day. After being coated, the water transfer body paper produced herein allows high stripping speed, stripping time is up to 30 seconds, and high smoothness and good surface performance of the body paper provide better properties for products.