The invention discloses a combined air conditioning system with a solar driven refrigerator and a carbon dioxide heat pump in the technical field of solar utilization and air conditioning, which comprises a heat collection system, a heat accumulation system, a domestic hot water supply system, a heat pump air conditioning system and an air conditioning indoor end system, wherein the heat collection system is sequentially connected with the heat accumulation system and the domestic hot water supply system in series; and the heat accumulation system is sequentially connected with the heat pump air conditioning system and the air conditioning indoor end system in series. The combined air conditioning system can realize the comprehensive needs of a building in year-round refrigeration, heating and domestic hot water and balance overall refrigeration and heating capability, has relatively more perfect entire performance and higher performance indexes, adopts environmentally-friendly working mediums, utilizes renewable energy sources and realizes reduction in dependence on primary energy.