The invention discloses a micro-channel regenerative cooling micro-combustor. By the aid of a combustion cavity body, a middle base plate, a micro-channel plate and a top cover plate, the combustion cavity, the middle base plate and the micro-channel plate form a closed combustion cavity, wherein the middle base plate, the micro-channel plate and the top cover plate are sequentially arranged on the upper side and the lower side of the combustion cavity in a laminated manner. Fuel oil flows through the micro-channel plate and then is sprayed into the combustion cavity body through a fuel oil atomizing nozzle, the fuel oil is ignited after mixed with air entering an air inlet, the fuel oil simultaneously serves as a coolant, heat released by the combustor is absorbed by a micro-channel, and the wall of the combustor is cooled while combustion efficiency is improved, so that regenerative cooling is realized. By taking the advantages of large surface area and micro-size effect enhanced heat exchange of the micro-channel, the wall temperature and the temperature gradient of the combustor are reduced, the problem of excessive heat stress is solved, and effective heat protection of the combustor is realized. Besides, preheated fuels are cracked, ignition performance is improved, and extinction limit and combustion efficiency are increased.