To provide an absorption air conditioning hot water supply system which performs a hot water supply operation, a cooling operation, or a heating operation, and emits less carbon dioxide.

The absorption air conditioning hot water supply system includes: an absorption heat pump circuit 1; a warm water circulating circuit which causes water extracted from a hot water storage tank 31 to flow through a first heat exchanger 17 in a condenser 5 and a second heat exchanger 21 in an absorber 9 to return to the top of the hot water storage tank 31, a cooling medium circulating circuit which circulates a liquid cooling medium through a bottom-side third heat exchanger 35 in the hot water storage tank 31 and a fourth heat exchanger 19 in an evaporator 7, an air conditioning circuit which circulates the liquid cooling medium between a bottom-side fifth heat exchanger 37 or a sixth heat exchanger 41 above the fifth heat exchanger 37 in the hot water storage tank 31 and an air conditioning heat load 87, a first heat collecting cooling medium circulating circuit which circulates the liquid cooling medium through a solar heat collector and a heat accumulating tank 51, a seventh heat exchanger 15 which is disposed on a channel for a diluted solution flowing from the absorber 9 to a reclaimer 3 and exchanges heat between the diluted solution and the liquid cooling medium coming out of the heat accumulating tank 51, and a second heat collecting cooling medium circulating circuit which circulates the liquid cooling medium between the seventh heat exchanger 15 and the heat accumulating tank 51.