The invention discloses an air cooling device utilizing cold air flow to conduct saline water cooling. The air cooling device comprises an air cooling wall structure, a saline water pump and a saline water storage device. The air cooling wall structure comprises one or more layers of air coolers. Each air cooler comprises one or more air cooling installation units. Each air cooling installation unit comprises a fin pipe bundle frame, a fin pipe bundle, a vertical shutter, a transverse shutter and a draught fan, wherein the fin pipe bundle, the vertical shutter, the transverse shutter and the fan are arranged on the fin pipe bundle frame, the transverse shutter is arranged between the two corresponding transversely-adjacent fin pipe bundles and connected into an N-shaped structure together with the fin pipe bundles, and the vertical shutter is arranged on the portion, close to the air inlet of the fin pipe bundle, of the fin pipe bundle frame. By means of the air cooling device, natural wind can flow down to achieve heat exchange, the air cooling device is suitable for large-scale heat exchange, saline water is used as heat exchange agent so that the air cooling device can be safe and reliable, and meanwhile the heat exchange area can be adjusted according to actual requirements.