The two-way shuttle can be programmed to perform tasks such as storage and retrieval, and transportation. It can be perfectly integrated with the logistics information system (WCS/WMS) and realize functions such as automatic identification and storage and retrieval. The shuttle can reach any position of the same aisle shelf with the cooperation of the layer-changing elevator. The clamping shuttle adopts a new device that can quickly keep the synchronous belt in a stable state, realizing the normal operation of the shuttle. In addition, this tensioning wheel device is simple to make, easy to install, and can be quickly adjusted, which not only saves costs, but also saves space and improves work efficiency.