Abstract: A condenser with capillarity cooling devices provides a condenser that has a plurality of cooling fins with a wick structure and a plurality of capillary water absorption layers of which the lower section is submerged in the water of a water reservoir provided underneath. Through capillarity and the characteristic of the capillary water absorption layers, water will be brought upward to moisturize the fins. When the water evaporates, a great amount of heat will be extracted from the fins, so as to increase the thermal efficiency of the condenser. Further, a pre-wetting water pipe is included, so that when an air conditioner is switched on and the condenser is started, the pre-wetting water pipe moisturizes the capillary water absorption layers immediately, and such moisture extends to the overall wick structures of fins. This will make evaporation take place instantly and thermal efficiency of condenser is increased.