A cutting plate (2) for a tractor (30) is described, comprising a frame (50) with which at least one rotor (61) is associated, driven by a driving belt (71), and to which a cutting blade (64) is fixed underneath, said cutting plate (2) further comprising at least one lever (3), which is rotatably associated with the frame (50) and separably associated with the tractor (30). A first end (81) of a wire (8) is fixed to said lever (3), the second end (82) of which is fixed to a body (9) associated with the frame (50), said body (9) being selectively movable between a locking position and a releasing position of the rotor (61), in said locked position the body (9) is reversibly associated with the rotor (61). (Fig. 3).
