The present invention relates to a wide harrow for a tractor, and more particularly, to a wide harrow for a tractor that restrains a rotation angle of an auxiliary harness plate to cause the auxiliary harness plate to be rotated upward by a predetermined angle when the auxiliary harness plate hits a rice field. The configuration of the present invention includes a central drive plate 210 that is raised or lowered by a hydraulic cylinder 100 at the rear of the rotor bator and connected to the rotor bator by a harness frame 150, (220) having one side hingedly coupled to the left and right sides of the left and right sides of the left and right sides and folded forward； And an auxiliary drive plate (300) hingedly connected to one side of the outer side drive plate (220) by a hinge coupling part (230) so as to be rotatable upward, characterized in that the outer side drive plate The spring rings 221 and 330 are respectively formed on the other side of the auxiliary relay board 220 and the other side of the auxiliary side board 300. Both ends of the spring rings 221 and 330 are fixed to each other, A spring 400 is installed to maintain the state of the hinge coupling part 230 during operation or unfolding operation. The hinge coupling part 230 includes a first bracket 231 provided on the upper surface of the other side of the outer side plate 220, A second bracket 232 provided on an upper surface of one side of the auxiliary circuit board 300 so as to be provided on the inside or the outside of the first bracket 231 and a second bracket 232 passing through the first bracket 231 and the second bracket 232 And a hinge shaft 233 coupled to the first bracket 231. A part of the outer circumferential surface of the first bracket 231 And the second bracket 232 is provided on the second bracket 232 so as to be caught by the rotation restricting jaw 240 when the auxiliary separator plate 300 is folded, 300 are rotated at less than 90 degrees and then returned to the original stat
