In order to realize the effective application of online near-infrared technology in feed production line, an online monitoring platform for non-contact near-infrared probe was designed. The platform was installed at the delivery chute between the bucket elevator and the rotary distributor. The aggregate space formed by the baffle structure was added inside the platform to affect the trajectory of the feed particles, so as to reduce the speed of the feed flow and improve the uniform stability of the feed flow. The EDEM-Recurdyn coupling simulation model was constructed based on the geometric structure of the platform. Taking the length of square tube, width of square tube, fixed baffle angle, and length of fixed baffle as influencing factors, and the mean velocity and coefficient of variation of feed particles in the online nearinfrared monitoring platform as evaluation indicators, a four-factor and three-level orthogonal test was carried out. The range analysis results of orthogonal test showed that the width of the square tube had the most significant influence on the feed flow velocity and uniformity characteristics. The optimal scheme for the platform structure parameters could be obtained under the condition that the length of square tube was 850mm, width of square tube was 250mm, fixed baffle angle was 20°, and length of fixed baffle was 180mm. In this case, the mean velocity of feed particles was 0.87m/s and the coefficient of variation was 5.32%. The effectiveness of simulation optimization results was verified through prototype tests. The platform could continuously obtain near-infrared spectral curves meeting the requirements of online analysis.