Foldable tray

A foldable tray, comprising a baseplate, and a first side plate and a second side plate arranged on two opposite sides of the baseplate;

• wherein the first and second side plates are both hingedly connected to the baseplate, and lie on the baseplate after being folded in an overlapping manner;
• wherein, the first and second side plates are height-adjustable, an extension side plate that is stretched out from the interior of the side plate is arranged at the top of each of the first and second side plates;
• the stretching height of the extension side plate is controlled by a prepositioning apparatus arranged in each of the first and second side plates;
• a movable cross rod is disposed on the extension side plate for fixing an article;
• wherein, a side plate folding lock is arranged on each of the first and second side plates for the control of opening and closing the first and second side plates;
• wherein the tray further comprises roller shutter side plates arranged on the other two opposite edges of the baseplate;
• the roller shutter side plates are rolled in roller shutter storage apparatuses located in the baseplate, and are pulled out under the action of an external force, and when the external force disappears, the roller shutter side plates automatically retract.