Automatic stacker is the core of automated warehouse equipment in the warehouse by doing XYZ direction in order to achieve a three-dimensional movement of goods to take delivery function. Is divided into a single column and double-column stacker stacker by walking, lifting and fork to finish the job requires three drive mechanisms, using international advanced servo control system and absolute address system to recognize closed-loop control, with bar codes or laser ranging other high-precision recognition site, to achieve high-precision stacker operation.