The working principle of water-cooled radiator mobile phone is to reduce the temperature of mobile phone by absorbing and emitting heat through circulating water. Under normal circumstances, water-cooled radiator mobile phones will not produce condensed water. This is because the circulating water in the water-cooled radiator is closed and will not contact with the air, so there will be no dew condensation. At the same time, the design of water-cooled radiator mobile phone will also consider the problem of waterproof and moistureproof to avoid moisture from entering the mobile phone.