The invention provides a tray box. The tray box comprises a chassis, two side frames arranged oppositely, and two end frames arranged oppositely. The two side frames and the two end frames form a rectangular frame. Each end frame comprises a lower end frame and an upper end frame which can be at least overlapped partially, wherein the lower end frame is connected to the chassis, the upper end frame can be fixedly connected to the different positions in the height direction of the lower end frame, and thus the height of the end frames can be adjusted. Each side frame comprises a lower side frame and an upper side frame which can be at least overlapped partially, wherein the lower side frame is connected to the corresponding lower end frame, the upper side frame can be connected to the corresponding upper end frame and can move along with the corresponding upper end frame, and thus the height of the side frames can be adjusted. According to the tray box, the height of the side frames can be adjusted along with the end frames synchronously at the same time, and use is convenient. The tray box can be folded, and the spatial utilization rate is effectively promoted. In addition, the side frames of the tray box can be opened, goods can be loaded and unloaded very conveniently, the labor cost is reduced, and the working efficiency is improved.