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The forage crushers have the problems of high-power consumption, low productivity and so on, which restricts the development of this kind of equipment to the direction of low energy consumption and greening. To accurately predict the power consumption of the forage crusher and then optimize the design of low energy consumption, the power consumed by the forage crusher was divided into four parts based on the working principle of the forage crusher and the DEM-BPM-CFD coupling method： the power consumed by the interaction between materials and materials, air flow，and the mechanical structure （cutters, hammers and tooth plate）, power consumption for endowing the air in the forage crusher with static pressure and flow velocity, the power consumed by bearing friction and the power consumption of the whole machine vibration. At the same time, the mathematical models of power consumption and productivity per kW·h of each part were established respectively. The DEM-BPM-CFD coupling method was used to simulate the power consumption of the crushed materials of forage crusher, and the power consumption prediction model was verified by the power consumption test. Results indicated that the relative error between the theoretical calculation value of the power consumption prediction model and the measured value of the power consumption was 6.94 %, which showed that the power consumption prediction model of the forage crusher was basically accurate. The predominant power consumed by the interaction between the materials and the materials, the air flow, and the mechanical structure （cutters, hammers and tooth plate）, constituting more than three-fifths of the total power consumption. The subsequent significant the power consumption for endowing the air in the forage crusher with static pressure and flow velocity, representing over a quarter of the total energy usage. The power consumption of the whole machine vibration accounted for nearly one-tenth of the total power usage, respectively. The smallest proportion was the power consumed by bearing friction. The research result provided a foundation for the design of low-power forage crushers.