The invention discloses a preparation process of a fully-automatic stretched frame painting. According to the preparation process, a liftable platform rises to be combined with front and rear stretched painting clamps into a stretched painting platform, the back surface of a canvas is placed on the stretched painting platform, four edges of the canvas are positioned, two edges of the canvas are pressed by pressing legs of a turning plate on a rack, and a painting frame is placed on the canvas and is positioned; in the whole process, edge folding, tightening, corner folding and nailing are automatically completed. Through the preparation process, only one person pushes a button to automatically produce the stretched frame painting; meanwhile, the production efficiency and the yield of products are improved by automatic equipment production.