Unidirectional disc plow 1LYQ series is connected with tractor full suspension supporting, when the operation of the plow blade rotating movement, the soil for plowing and turning operations. It has the characteristics of not entangling grass, not blocking, not yong soil, being able to cut off crop stem rhizome, and working with less resistance, etc. It is especially suitable for the plowing operation of the farmland with complicated conditions such as overgrown weeds, standing stems, large soil ratio resistance, and masonry and stone fragments in the soil.