Combined-knife rotary blade free of twining grass

The utility model discloses a combined-knife rotary blade free of twining grass. The combined-knife rotary blade free of the twining grass is used for farmland ploughing and preparation machine, and comprises a rotary blade shaft, a tool changer, a rotary blade body and a secondary blade. The tool changer is formed by a main changer piece and a secondary changer piece in a welded mode, wherein edges are arranged on the two sides of the main changer piece and play a role in reinforcing ribs at the same time, the tool changer is welded to the rotary blade shaft, a knife handle of the rotary blade body is inserted into the tool changer, and is fastened through a bolt and a nut, and the secondary blade is welded to one side of the cutting edge of the rotary blade body of the main changer piece. Due to the combination between the rotary blade body and the secondary blade, when a rotary cultivator works, an integral cutting edge is formed from the tool nose of the rotary blade body to the rotary blade shaft, straw