A tractor harrow is provided to use the tractor harrow as a harrow ordinarily, and to use the tractor harrow in a state that the plow is simply coupled to the tractor harrow when using the tractor harrow as a plow. A tractor harrow comprises: mount brackets(101) installed at both sides of the lateral axis of a rotary coupled to the back of a tractor in a state that the mount brackets are spaced from the rotary; a mount(100) fixing a cylinder bracket(120) to the center of the mount brackets; connectors(200) which are rotatably coupled to connection holes formed in bottom sides of connection chassises(300); a supporting bar which is supported to a supporting rod fixed to a protrusion of the connection chassis; a plow mount(400) fixed to rear upper parts of the connection chassises; a hydraulic cylinder(500) connected between a fixed bracket(410) of the plow mount and a cylinder bracket of the mount; and a main harrow(30) which is fixed to a front lower side of each connection chassis by an "U" bolt(340), and which has auxiliary harrows(40) formed at left and right sides thereof.