Abstract: According to significant differences in aerodynamic characteristics of full and empty walnut，6FX-1000 type walnut winnowing machine was designed.Walnut was separated by specific gravity air separation method.Structure，basic parameters and working principle of the walnut winnowing machine were introduced.Test results showed that its productivity was more than 50 times of manual work，the cost was less than 2.5% of labor cost，and separation rate was more than 90%.6FX-1000 type walnut winnowing machine reduced labor intensity and production costs greatly.It had important significance for walnut deep processing industry.