Foldable double-layer grid trolley

The foldable double-layer grid trolley comprises a base, a lower protection frame and a first door plate, the lower protection frame is fixedly mounted at the top of the base, the first door plate is movably mounted on one side of the lower protection frame, a drawing groove is fixedly formed in the inner side of the side wall of the lower protection frame, and an upper protection frame is inserted into the top of an inner cavity of the drawing groove; the drawing groove is formed in the inner side of the side wall of the lower protection frame, the upper protection frame capable of being folded and shrunk up and down is arranged at the top of the inner cavity of the drawing groove, and the detachable second door plate and the partition plate are arranged, so that the whole trolley can be freely folded; whether one layer of goods stacking space or two layers of goods stacking space is needed or not can be selected according to using requirements, the upper layer can be folded, therefore, the occupied space of