Air compressor residual-heat utilization system and method

The invention provides an air compressor residual-heat utilization system and method. The air compressor residual-heat utilization system comprises a water storage tank, a computer control system, and a first heat exchanging system and a second heat exchanging system which conduct heat exchange with the air compressor respectively, wherein the first heat exchanging system comprises a hot water tank, a cold water tank, a heat exchanger, an internal circulation water tank and a heat pump unit; and the second heat exchanging system comprises an air compressor residual-heat recycling device. The invention also discloses an air compressor residual-heat utilization method. The air compressor residual-heat utilization system and method overcomes a plurality of defects in the prior art, and realizes full recovery of the air compressor residual heat, and the residual-heat utilization ratio approximates 100 percent.