A plant cutting machine: an output power unit is fixed at the rear of a back frame (10), a U-shape cutter carriage (20) is fixed at the front end of the back frame, a horizontal cross bar (202) of the U-shape cutter carriage (20) is fixed and connected with the front end of the back frame, an upper and a lower cutter blade holder (50), which are parallel to the horizontal cross bar, are arranged under the horizontal cross bar of the U-shape cutter carriage, and blades (501) are uniformly disposed on each blade holder (50), the blades on the upper cutter blade holder and the blades on the lower cutter blade holder form scissors, and a rotary cage is arranged on the top of vertical rods (201) at the two sides of the U-shape cutter carriage (20). An adjusting device (203), which is fixed and capable of adjusting the horizontal height of the rotary cage, is arranged on the top of the vertical rods at the two sides, and a gearbox transmission mechanism is fixed on the outer side of a vertical rod. The input end of the gearbox transmission mechanism is connected to the power output end by a flexible shaft, and the gearbox transmission mechanism outputs in two ways. One output is connected by a chain via the small sprocket (30) and a large sprocket (40) arranged at the same side of the gearbox transmission mechanism on the rotary cage, and the other output drives the upper and lower cutting blade holders to move via the gearbox transmission mechanism.La présente invention concerne une débroussailleuse comprenant une prise de force fixée à larrière dun châssis arrière (10), un chariot débroussailleur en U (20) fixé à lextrémité avant du châssis arrière, une traverse (202) horizontale du chariot débroussailleur en U (20) fixée et reliée à lextrémité avant du châssis arrière, des supports de lames supérieur et inférieur (50) qui sont parallèles à la traverse horizontale et disposés sous ladite traverse horizontale du chariot débroussailleur en U, des lames (501) qui sont unif
