Formula for calculating the area of the sieve openings by took soybeans as the object was derived, and sieving effects of cylinder sieves with different types of holes were also compared. It is concluded that the cylinder sieve with square sieve pores has the best screening effect on soybeans, which has been verified by simulation calculations. Besides, the paper chose the soybean sieve ratio and the impurity remove ratio to calculate the sieving effect. Orthogonal simulation calculations experiments were performed to obtain the influence order of different process parameters on the sieving effect of beans in cylinder sieves and the best process parameters: the tilt angle is 5°, the rotating speed is 16 r/min, the feeding speed is 14 t/h, and the sieve hole side length is 9 mm. Under the conditions, sieving effect increased by 3.89% from the original of 0.935.