The invention discloses an automatic mud removal mechanical device with a spiral drill rod rotating N 360 degrees. The device consists of a conical funnel, bolts with hooks, fixed stays, a downward quadrilateral mud removal blade and a downward quadrilateral sheath; one end, which is provided with the bolt with the hook, of each fixed stay faces downward, and the other end of the fixed stay facesupward and is connected with the outer wall of the lower end of the funnel; one end, which is provided with an acute angle, of the sheath passes through the outer wall of the lower end of the funnel and is inserted into the funnel and is fixed on the wall of the funnel; two ends of the sheath are both provided with openings; a plane wherein an inner port is positioned is parallel to an axial lineof the spiral drill rod, and the distance between the plane and a drill rod spiral sheet is the same as that between the plane and a lower port of the funnel; the included angle between the sheath and a horizontal plane is consistent with the inclination of the drill rod spiral sheet; one end, which is provided with an acute angle, of the mud removal blade is inserted into the funnel through the sheath; two sides of the other end of the mud removal blade are connected with two tensioning springs; and the other ends of the springs are connected with the outer wall of the funnel. The device hasa simple structure, is convenient to operate, and easy to manufacture, small in investment, low in cost, safe and reliable, and easy and convenient to assemble and disassemble and carry, and can remove mud without external power.