Plough and rolling harrow combined farm tool

The utility model discloses a plough and rolling harrow combined farm tool which comprises a hitch frame, a plough frame and a harrow frame, wherein the hitch frame is connected with a hanging component at the tail portion of a cultivation machine, the plough frame is provided with a disc plough, and the harrow frame is provided with a disc harrow. A pair of hinged supports on the hitch frame is matched with a pair of hinged points on the plough frame in a hinged mode, and a detachable supporting rod is arranged between a hinged support and a hinged point. A middle portion hinged support is arranged between the pair of the hinged supports on the hitch frame. The middle portion hinged support is matched with one end of an extensible adjusting rod in a hinged mode, and the other end of the extensible adjusting rod is matched with a hinged point of a first adjusting rod in the middle of the plough frame or a hinged point of a second adjusting rod in the middle of the harrow frame. Two side plates of the plough f