Method and device for extracting oil from kitchen garbage

The invention provides a method and a device for extracting oil from kitchen garbage. The method comprises the following steps of conveying kitchen garbage into a preheating tank, carrying out preheating, feeding the pre-heated kitchen garbage into a hydrothermal reactor by a pump, heating to a reaction temperature, carrying out a reaction process so that floating oil is formed, feeding the reacted kitchen garbage into a flash tank, carrying out temperature and pressure reduction, and carrying out oil-water separation of the kitchen garbage slurry subjected to flash evaporation to obtain oil. The method and the device adopt a kitchen garbage high-temperature high-pressure treatment technology, realize thorough killing of pathogens in kitchen garbage, realize production of floating oil convenient for recovery, and realize an oil recovery rate more than 90%.