Disclosed herein is a food garbage disposer including: a reaction vessel which includes a hopper into which food garbage is introduced, a heating tank filed with heat-medium oil to heat the hopper, and at least one heater to heat the heat-medium oil in the hopper; an automatic filter which includes an automatic injection nozzle and filters vapor discharged from the reaction vessel; a condenser which condenses the vapor passed through the automatic filter and separate the vapor into condensed water and air; a condensed-water purifier which purifies the condensed water produced by the condenser and supplies the purified water to the automatic injection nozzle of the automatic filter; a deodorizer which purifies and deodorizes the air produced by the condenser; and an air circulation adjuster which mixes the air passed through the deodorizer with external air and reintroduces the mixed water into the reaction vessel. With this configuration, the food garbage disposer is improved in not only preventing an offensive odor from generating since the condensed water produced in the condenser is utilized for filtering the vapor discharged out of the reaction vessel, but also automating a full operation thereof since temperature of the reaction vessel is automatically controlled to facilitate drying and decomposition of the food garbage.