Combined-cutter rotary blade free of grass twining

The invention discloses a combined-cutter rotary blade free of grass twining used for farmland plough and preparation machinery. The combined-cutter rotary blade free of grass twining comprises a rotary blade shaft, a cutter changer, a rotary blade body and an auxiliary cutter. A primary changer piece and a secondary changer piece are welded to form the cutter changer. The primary changer piece is provided with edges on two sides and serves as a reinforcing rib. The cutter changer is welded on the rotary blade shaft. A handle of the rotary blade is inserted in the cutter changer, and is fixed through a bolt and a nut. The auxiliary cutter is welded on one side of a cutting edge of the rotary blade of the primary changer piece. Due to combination of the rotary blade and the auxiliary cutter, when a rotary cultivator works, an integrated cutting edge is formed form a point of the rotary blade to the rotary blade shaft to cut off straws, so that the problem that working efficiency is affected due to the fact tha