The invention discloses an energy recovery type household waste disposer capable of converting solid combustible substances in household waste into combustible gas for recycling and discharging food waste through a discharge port after grinding the food waste. In a machine shell provided with a feed port and the discharge port, a combustible waste disposer, a food waste disposer and an engine which are coaxially driven and directly coupled are arranged; a stirrer and a heater are arranged in the combustible waste disposer; and a grinder is arranged in the food waste disposer; a set of gas processing system consisting of a chemical treater, a compressor, a gas storage cylinder and a pressure reducer is connected with the combustible waste disposer through a pipeline; an electric control box arranged on the upper part of the machine shell and provided with a microprocessor is respectively electrically connected with power utilization devices of the parts and a sensor arranged on the electric control box through connecting leads and carries out safe detection and motion control on the working processes of various parts according to information fed back by the sensor so as to automatically convert the solid combustible substances in the household waste into the combustible gas for storage and output, and discharge the food waste through the discharge port after the food waste is ground.