The invention relates to a SCAL indirect air-cooling system, mainly comprising a surface condenser, a recycling water system, a fog type aluminum pipe and aluminum flake radiator and an air-cooling tower, wherein in the surface condenser, after the wasted steam discharged from the steam turbine performs the first heat exchange with the cooling water, the wasted steam transmits the heat to the cooling water and condensed to condensed water, then flow back to the air-cooling system heat system, the cooling water flows to the fog type aluminum pipe and aluminum flake radiator via the recycling water pump after it is heated up, and the cooling water secondarily exchange heat with the environmental air, the cooling water transmits the heat to the air and makes the water temperature decrease, and then return to the cooling steam turbine of the surface condenser, the system recycles like this. The invention has the advantages that the Haman type indirect air-cooling system is separated from the steam water system, the water quality controlling and disposing is easy, the Hailer system air-cooling tower has a small body, The invention takes up small area and the capital cost of reactor plant is low.