The invention discloses a change method for a working roll of a roll coating machine. The change method comprises the following steps: detecting a new roll; judging whether the new roll meets change requirements or not; disassembling a protective cover of the roll coating machine and an old roll of the roll coating machine; clearing the mounting position of the new roll on the roll coating machine; arranging the new roll at the mounting position; adjusting the position of the new roll to a position required by production, and fixing the new roll; mounting a sealing device; restoring the protective cover; and starting the roll coating machine, carrying out detection and putting the roll coating machine into use after detection shows that the roll coating machine is qualified. According to the change method for the working roll of the roll coating machine, the whole change process is divided into a plurality of steps, and specification and control are carried out on each step, so that the standard specification of the change process of the working roll is realized, the change precision of the working roll is ensured, the machining precision of the roll coating machine is accordinglyensured, and the machining quality of the product is ensured.