The utility model relates to the technical field of air separation. The waste heat application equipment of the air separation workshop comprises a heat exchanger, on the basis of an original air compressor cooler and an original supercharger cooler, a cooling tower and an absorption refrigerator with a power source being dead steam of an air cooling island are additionally arranged, compressed air entering an air separation tower is further cooled, it is guaranteed that the temperature of the compressed air is not too high when the external air temperature rises, and then the production efficiency of the air separation tower is guaranteed; according to the technical scheme, the residual heat energy of the coal-to-methanol plant area is further applied, the production efficiency of the airseparation tower can be improved, and the application prospect is very strong.