The shuttle car system is a new type of intelligent dense storage solution, consisting of four-way vehicles, high-speed elevators, customized shelves, inbound and outbound conveying devices, and warehouse control systems. The four-way vehicle can travel independently in both vertical and horizontal directions, meeting the adjustability and flexibility of warehouse inventory and inbound and outbound frequency. Coupled with the excellent performance of high-speed elevators, tasks between equipment can be backed up to each other, and the system can still continue to operate in the event of equipment failure. Suitable for box/pallet cargo storage. Realize the automatic handling, storage, sorting, and other functions of the entire pallet of goods in the dense storage three-dimensional warehouse, reduce the non intelligent problem of frequent interaction between one-way shuttle trucks and stackers or forklifts in traditional shuttle truck style shelf storage, and meet the high density, high space utilization, and high intelligence requirements of shelf style dense storage. The pallet four-way shuttle can rely on its own mechanism to complete the dual coordinate direction travel, thus achieving a storage solution for the entire layer of goods storage and retrieval in the X/Y direction. Under the control of the PLC system, precise positioning is achieved at the bottom of each pallet through control methods such as laser ranging and photoelectric positioning. The shuttle car runs on the track below the pallet and can support the pallet to store or retrieve the goods on the pallet.