Aiming at the problems of large-scale food waste treatment production line, such as large capital investment, high cost of equipment operation and maintenance, and single operation form of small-scale food waste treatment equipment, based on SolidWorks, a kind of food waste treatment equipment, which integrates feeding, crushing, compression and dehydration, is designed to realize high integration, high automation, low energy consumption and low operation cost of food waste resource utilization Slag liquid separator. The particle model was established by EDEM software, and the particle motion parameters of kitchen waste were analyzed and optimized by RNG k—ε turbulence model in Fluent. The results show that when the screw speed of the separator is 150 r/min, the operation of the separator is stable and the speed is kept at 0.05~0.07 m/s. In the range of 4.75~4.90 s, the velocity of particles reaches the maximum value of 0.14 m/s, and the force reaches the maximum value of 1.49 N, which can achieve fast and effective solid-liquid separation, significantly reduce the retention of harmful substances, and obtain higher resource recovery.