Air conditioning system with defroster and central air conditioning hot water system

The invention discloses an air conditioning system with a defroster and a central air conditioning hot water system with the air conditioning system. The air conditioning system at least comprises a refrigeration and heating loop and a regenerator, wherein the refrigeration and heating loop is at least composed of a compressor, a four-way valve, an outdoor heat exchanger, an expansion valve and indoor heat exchangers which are connected through pipelines; the regenerator is internally provided with two groups of heat exchangers which can output heat, and the heat exchangers are respectively connected with an air-conditioning system pipeline through the pipelines; the regenerator is also internally provided with a third heat exchanger used for storing heat for the regenerator, and a connecting pipeline of each heat exchanger is connected in series with a control valve; a circulating pipeline arranged between the indoor heat exchangers and the expansion valve is connected in series with a control valve III whic