The invention provides a method for chip removal of a gantry type machining center machine. The method comprises the steps of manufacturing a spiral chip removal device and a washing device according to measurement dimensions, installing the spiral chip removal device and the washing device, debugging the spiral chip removal device, and starting the spiral chip removal device and the washing device to perform spirally wash and discharge large steel chips and small steel chips respectively. According to the method for chip removal, the steel chips generated in the machining process of the gantry type machining center machine can be discharged respectively, machining precision of a machine tool is effectively guaranteed, and the service life of the machine tool is prolonged.