The fan screw nut for removing scraps includes a screwing hub, multiple fan blades and a frame. The screwing hub has an outer periphery. The fan blades are spiral in shaped and are formed around the outer periphery of the screwing hub. A flux space is formed between each fan blade. The frame is formed integratedly on an outer periphery of a front side of the fan blades. Multiple through holes are formed between the inner side of the frame and the flux spaces for air flowing. The fan screw can be introduced air into flux space via through holes to blow up scraps that generated from cutting a work piece.