The invention provides a control method for gear blank and workpiece integrated machining. Through intelligent control over a machining machine tool double cutting mechanisms, integrated machining of a gear blank and a workpiece is achieved, and the repeated positioning accuracy and the coaxiality are ensured. During gear machining, automatic switching of the milling cutter cutting mechanism and the hob cutting mechanism is conducted in different machining stages, the milling cutter cutting mechanism mills an original gear bar material into the gear blank in the preset shape, and the hob cutting mechanism rolls the machined gear blank into a target gear workpiece. Through the control method, machining of the gear blank and the gear workpiece on the same machine tool is achieved, disassembly and second clamping do not need to be conducted on the blank, the production efficiency is improved while the gear machining accuracy is effectively improved and gear face jumping is reduced, and the production cost is reduced.