The present invention is mounted on the upper side of the rotor (B) mounting unit 110； A connecting frame 120 formed to rotate up and down on one lower side of the mounting unit 110； A cylinder 130 for rotating the connection frame 120 up and down on an upper side of the mounting unit 110； A cover 140 formed to rotate up and down and left and right at the rear of the rotor bator； A central thermal blade 150 formed to be rotated up and down based on a hinge portion 151 provided at a lower portion of the cover 140； A pair of auxiliary thermal blades 160 formed so as to be moved outward and inward along the longitudinal direction of the central thermal blades 150； An auxiliary cylinder 170 for moving the auxiliary thermal blade 160 outward and inward on one side of the central thermal blade 150； A horizontal holding unit 180 configured to rotate the cover 140 and the central thunderal 150 to the left and right according to the ground condition on both sides of the rotor bator to maintain horizontality； Connected to the connection frame 120 to rotate the cover 140 and the central herald 150 up and down by the operation of the cylinder 130, and according to the ground condition, the cover 140 and the central herald 150 To provide a harrow for a tractor comprising； a buffer unit 190 to form a buffer so as to buffer up and down, the present invention maintains the horizontal level of the harrow blades in the process of flattening the field or paddy, thereby smoothing the flat surface. It has the effect of being able to proceed. In addition, the present invention has an effect that can improve the work efficiency in response to the left and right and up and down shaking that occurs according to the flat work of the field or paddy field. In particular, the present invention has the effect of improving the durability as well as the service life by minimizing deformation such as a thunderal.본 발명은 로터베이터(B)의 상부 일측에 장착하는 장착유닛(110)； 상기 장착유닛(110)의 하부 일측에 상하로 회동할 수 있도록 형성하는 연결프레임(12
