Anti entanglement knife staggered installation method: The left and right curved knives are staggered and symmetrically installed on the knife shaft. The two knives at the outer end of the knife shaft are all bent inward, so that the soil blocks are not thrown to both sides, which is conducive to the next cultivation. This installation method is commonly used to level the ground after cultivation. The blades are all bent towards the middle of the blade shaft, and there is a ridge in the middle after cultivation, which plays a role in filling the ditch. At the outermost end of the blade, bend inward and outward, starting from the middle, and the blade bends towards both ends of the blade shaft. This installation method has a ditch on the ground after cultivation, which is suitable for joint operations of trenching.