The invention relates to an airborne combined cooling and heating system used for combining a mixed auxiliary power generation device on a multi-electric aircraft and an ammonia absorption-type refrigeration device. The airborne combined cooling and heating system comprises the mixed auxiliary power generation device and the ammonia absorption-type refrigeration device; the mixed auxiliary power generation device mainly comprises a minitype gas turbine, a high-temperature oxide fuel cell, a compressor and the like; the high-temperature oxide fuel cell is used for generating electric energy; the minitype gas turbine utilizes the residual heat waste gas generated by the high-temperature oxide fuel cell to not only be capable of providing the power for the compressor, but also be capable of generating the electric energy; the ammonia absorption-type refrigeration device mainly comprises a generator, a condensation generation device, a condenser, an evaporator and the like; the ammonia absorption-type refrigeration device utilizes the waste heat exhausted by the minitype gas turbine to carry out refrigeration, thus achieving the object of cooling avionic devices; and the refrigerationdevice sufficiently utilizes the residual heat waste gas for a series of treatment and cools a part of the electronic equipment. The airborne combined cooling and heating system saves both the electric and the energy.