The invention discloses a city sewage treatment air conditioning system which comprises a sewage treatment system, a sewage heat recycling system, a sewage utilizing system and an air conditioning system. The sewage heat recycling system is laid on the sewage treatment system. The sewage treatment system is connected with the sewage utilizing system and the air conditioning system through pipelines respectively. By the arrangement, the city sewage treatment air conditioning system has the advantages that the sewage which meets the national emission requirements after being treated by the sewage treatment system is respectively replenished into the air conditioning system and the sewage utilizing system, and water is saved to the maximum extent; the sewage heat recycling system laid on the sewage treatment system absorbs the heat of the sewage in the sewage treatment system and supplies the heat to the air conditioning system, and heat resource waste is reduced.