The utility model belongs to the technical field of automobile parts processes the frock, a automatic saw bit device of changing of production line is provided, including main frame and the main mounting panel of setting on the main frame, be provided with the power head component of robot on the main frame, four station supports have on main mounting panel, and wherein two station supports are placed the new saw bit of change and are used for saw cutting the process, and two station supports are used for placing and make the expiring saw bit in addition, are provided with inductive switch on every station support, main mounting panel and main frame roll out the installation for rotatable, still be provided with on the main frame and be used for carrying out the locating component that fixes with main mounting panel. The utility model has the advantages of the process production line of whole change continues the production operation, need not shut down the wait, and the device improves production efficiency, and the improve equipment utilization ratio is solved the automatic production line tradition and is changed the saw bit inefficiency, shuts down bottlenecks such as wait.