Abstract: Pallet stacking machine is a important machine for stacking a group of pallets in goods transportation system of automated storage and retrieval system. For the machine, the lifting mechanism is the key component. The paper analyzes the custom’s requirements and design a pallet lifting system which is suitable for 1300×1100×150 pallet. It chooses a 3-phase asynchronous motor, design the transmission shaft, and uses the SolidWorks Simulation module to verify the shaft’s stress and safe coefficient. All above says the system is accurate and reliable.