The condenser is the key heat exchange equipment in the self-circulation evaporative cooling system, the flow channel structure design will directly affect the heat transfer effect. This study used a simplified three-dimensional model of the serrated and parallel fins to verify the heat transfer performance of the heat transfer channel. The advantages of the serrated fins channel in the self-circulating evaporative cooling system are verified in the experiment compared with the parallel flow channel. The heat transfer fluid is R113 in numerical simulation and experiment, and the water is coolant in the experiment, performance tests were carried out for different vapor inlet mass flow rates on the heat transfer fluid side. The serrated fins channel enhances the disturbance of the heat transfer fluid and interrupts thermal boundary layers, avoiding the local aggregation of the condensate. The condenser with the serrated fins channel realizes the global participation in heat transfer, which leads to the overall contours of temperature being relatively uniform. In summary, the condenser with serrated fins channel has a compact overall structure, small thermal resistance, and large heat transfer area, which can achieve full and efficient heat transfer.