The invention discloses an electricity-heat-cold united supply unit for a micro gas turbine. The electricity-heat-cold united supply unit comprises the micro gas turbine, a refrigerating machine, a smoke-liquid heat exchanger, an afterburning boiler, a cooling tower, an air processor, a hot water tank, a cold water tank and the like; smoke of the micro gas turbine is discharged from a direct discharge outlet, a smoke outlet of the refrigerating machine and a smoke outlet of the smoke-liquid heat exchange through pipes; a liquid outlet of a refrigerant of the refrigerating machine is connected with a liquid return opening of a refrigerant of the air processor, and a liquid return opening of the refrigerant of the refrigerating machine is connected with a liquid outlet of the refrigerant of the air processor; a liquid outlet of a heating medium of the smoke-liquid heat exchanger is connected with a liquid return opening of a heating medium of the afterburning boiler, and a liquid return opening of the heating medium of the smoke-liquid heat exchanger is connected with a first cold-heat switching valve; a liquid outlet of the heating medium of the afterburning boiler is connected with a second cold-heat switching valve; a water outlet of the cooling tower is connected with a cooling water inlet of the refrigerating machine, a water return opening of the cooling tower is connected with a cooling water outlet of the refrigerating machine, and a water supplement opening of the cooling tower is connected with a water supplement outlet of the cold water tank; a hot water outlet of the hot water tank is connected with a hot water inlet of the afterburning boiler, a hot water inlet of the hot water tank is connected with a hot water outlet of the afterburning boiler, and a water supplement opening of the hot water tank is connected with a water supplement outlet of the cold water tank; and a showering water outlet of the hot water tank and a showering water outlet of the cold water tank are connected with an inlet of an external showering facility.