In a server cooling device having a cold zone and a hot zone, a flow of cold air is determined depending on an air conditioner disposed in the hot zone and a size of a casing. A server cooling system is provided in which a chamber is substantially divided into two parts with a cold aisle formed in one part and a hot aisle formed in the other part, and a server rack is disposed on a boundary between the cold aisle and the hot aisle. The server cooling system includes: an air conditioner provided on the hot aisle side; a circulation path disposed so as to extend from the air conditioner to the cold aisle; and a shield provided on the boundary excluding the server rack. The shield is provided with a gallery capable of venting from the cold aisle to the hot aisle.