NOVELTY - Kitchen waste degradation comprises collecting kitchen garbage, mechanically dehydrating to obtain solid phase and liquid phase solid phase doped mixed phase; crushing separated solid wastes, performing wet degradation; expanding, flash evaporating, dehydrating; drying; adding additive, filling, sealing; separating liquid phase solid phase doped mixed phase to obtain water, oil and slag, collecting separated oil for biodiesel oil raw material and selling, purifying separated water recycling or discharging, directly feeding slag into hydrothermal water-moisture hydrolysis tank.    USE - Kitchen waste degradation used for producing animal feed and biodiesel oil raw material (claimed).    ADVANTAGE - The method is short and has low energy consumption thus saving more than 50% energy. The animal feed does not affect growth of animals.    DETAILED DESCRIPTION - Kitchen waste degradation comprises collecting kitchen garbage, entering into dewatering machine, mechanically dehydrating to obtain solid phase, liquid phase solid phase doped mixed phase; separating solid-phase wastes, crushing solids, entering into hydrothermal water-moisture hydrolysis tank, performing wet degradation with saturated steam at 140-160 degrees C and 0.4-7 MPa for 60-80 minutes; expanding wet-processed garbage in spray tank, performing flash evaporation and dehydration; further drying product in drying machine; adding additive, filling through automatic bagging machine, sealing package; entering liquid phase solid phase doped mixed phase in three-phase separator, separating water, oil and slag, collecting separated oil for biodiesel oil raw material and selling, taking separated water into wastewater treatment pool, purifying, recycling or discharging, directly feeding slag into hydrothermal water-moisture hydrolysis tank. The wet degradation tank comprises tank body provided with a bracket, kitchen garbage feeding port, steam inlet, safety valve, pressure gauge and small exhaust valve, and product outlet.