The invention relates to an assembly method for an automatic cooker. The assembly method comprises the following steps of: step 1, assembling side plates, forming a plurality of side wing slots in openings of the side plates, and guaranteeing that the side wing slots are positioned at the same side of the side plates, and are downwards arranged in an inclined manner; step 2, mounting a main frame body part, assembling a rack and mounting a cooking bench on the rack, mounting a conveyor belt on the centerline position of the upper end of the cooking bench; and separately mounting a plurality of pot bodies above a plurality of heating devices of the cooking bench; step 3, mounting a hopper; step 4, mounting a pot cover; step 5, mounting a seasoning box; and step 6, mounting an electric pushing rod. The assembly method has the beneficial effects that: the assembly of the automatic cooker is completed according to a sequence of sequentially mounting the side plates, the main frame body part, the hopper, the pot cover, the seasoning box and the electric pushing rod, so that mounting time is saved, the service life of the automatic cooker is prolonged; and moreover, the assembly method is time-saving in mounting, is low in mounting difficulty and is high in assembly efficiency.