Abstract: In view of the lack of suitable machinery for flax harvest in Shanxi province，4GL-140 type flax harvester was successfully developed by improving design of important work parts based on wheat swather.It could harvest flax，also could harvest wheat，and minor cereals such as naked oats，peas and beans.Many uses of a machine was realized.The machine filled the gap in Shanxi′s flax harvest machinery and had wide application prospect.