The invention discloses a combined cooling, heating and power supply system. The combined cooling, heating and power supply system is characterized by being formed through treating a SOFC / GT hybrid power generation system as a reference system and introducing CO2 circulation, ORC circulation and a LNG cold energy utilization system. According to the combined cooling, heating and power supply system, a SOFC / GT serves as a prime mover, high-temperature waste heat, medium-temperature waste heat and low-temperature waste heat of a recovery system of the CO2 circulation and the ORC circulation areutilized correspondingly, and an LNG is used as a cold source for the CO2 circulation and the ORC circulation, and therefore, external cooling (air conditioning and refrigeration), external heating, external power supply, external natural gas supply and external supply of ice and dry ice can be achieved; and the low-carbon emission of the system is realized by condensing and separating CO2 in a flue gas, the available energy loss of the combined supply system can be effectively reduced, gradient and efficient utilization of energy is achieved, and the good energy-saving and emission-reducing effects are achieved.