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With the aim to explore the influence of collision on extruded pellet feed during air delivery, perch extruded pellet feed was taken as the research object to simulate the collision and breakage of extruded pellet feed through experiments and simulations, exploring the breakage mechanism and law. The horizontal collision test platform was used to explore the influence of different collision speeds on the breakage of extruded pellet feed, and the breakage function was used to establish the fitting relationship between breakage size and collision speed. The determination coefficient of parameters fitting was greater than 0.99. The breakage state of extruded pellet feed was divided into four states, unbroken, partially broken, broken, and disintegrated. The critical collision velocity was 25.60m/s, and the corresponding airflow velocity was 56.29m/s. The discrete element model of extruded pellet feed was established by discrete element method (DEM) and the parameters were calibrated. Based on EDEM software the critical breakage speed of 25.20m/s was obtained by simulating the collision breakage process, and the difference between the critical speed obtained by experiment and simulation was 1.6%. In the EDEM post-processing, the relationships between the collision speed and the breakage rate and the maximum size ratio were obtained. As the speed increased, the breakage rate was also increased. However, the maximum size ratio was decreased. The relationship between the breakage rate and the energy loss was also obtained. The figure of breakage rate showed linear change first, and then exponential change. But the maximum size rate was the exponential change. And in the intersection of the two lines at about 25.20m/s cliff-like declined. When the collision speed was less than 25.20m/s, the breakage rate was linearly related to the loss energy. After reaching the critical breakage speed, the loss energy was changed exponentially. The results provided data support and theoretical reference for explaining the breakage mechanism of extruded pellet feed.