The structure and working principle of the chopping conveyor were analyzed, and the theoretical relationship between the angle of the incision, the length of the stem segment and the conveying efficiency of the crushed stem conveyor was established, and the theoretical values of the three were calculated. The change of working speed would cause the fluctuation of the corn stalk feeding amount, which had significant effects on the length of the cut section, the angle of the cut, and the transport efficiency of the broken stem. Taking the working speed as the test factor, the angle of the stem cut, the length of the cut section and the transport efficiency were taken as the test indicators. The field test was carried out, and the angle of the stem cut was calculated. The actual value of the length of the cut section and the conveying efficiency were calculated by data regression, and the mathematical model of the working speed and the angle of the cut, the length of the stem cut, and the actual value of the transport efficiency of the crushed stem conveyor were respectively obtained. Through the speed stalk chopping and conveying device, the model was actively designed to reduce the design deviation of the theoretical calculation model, and provided a reference for the design of the similar device based on the field conditions.