The utility model relates to the technical field of serving cars, and discloses a self-service serving car with a rotary belt, which comprises an automatic guide transport car and a food tray, the top of the automatic guide transport car is provided with a fixing frame, a conveying belt and a meshing transmission part, and four corner structures of the fixing frame are respectively sleeved with a composite transmission shaft through a bearing. The four composite transmission shafts, the conveying belt, the fixing frame and the bearing platform are arranged to form a multifunctional swing mechanism, then the automatic guide transport vehicle is linked, and after food trays containing food are combined for use, the automatic guide transport vehicle moves the whole device and the food trays containing the food according to a preset moving track; therefore, multi-position and multi-direction pick-and-place conditions can be provided when guests who have dinner are close, the using effect is fully optimized, multiple guests can be synchronously served, and compared with the prior art, the practicability is higher.