Multi-layer conveying system

The invention discloses a multi-layer conveying system. The multi-layer conveying system comprises a trolley, two lifting devices and a multi-layer working assembly, the working assembly comprises a plurality of working stations, and each working station comprises a first guide rail assembly, a first driving assembly, a lateral positioning assembly, a vertical direction positioning assembly and a conveying direction positioning assembly. According to the multi-layer conveying system, the conveying trolley is lifted through the lifting device, the first driving assembly drives the trolley to move in the horizontal direction, workpieces are conveyed through the trolley, the trolley is roughly guided through the first guide rail assembly, therefore, the precision requirement of the whole system can be lowered, and low-cost and high-speed conveying is achieved; and at the preset position needing to be positioned, the trolley is accurately positioned through the lateral positioning assembly, the vertical direction