In order to achieve the precision-feeding of dairy cow, the device accuracy must be assured. Based on the study of traditional feeding device, dairy cow precision feeding spiral device was designed using equal-diameter and variable-pitch methods in this study. The effect of different spiral spindle speeds and feeding times of testing device on the stability of precision feeding were studied through the experiment. Then, the spiral spindle speed was determined and the feeding model was designed. The experimental results showed that the 150 r/min was the most stable screw speed, feeding precision was above 95% and the maximum time of feeding was 11 s. The precision of feeding can meet the requirements of precision feeding of dairy cow.