Abstract: In order to improve the evaporation efficiency of solar interface evaporation,this paper designs a hot air blowing solar interface evaporation device from two aspects:changing the structural design and photothermal materials.The evaporation device utilizes high-temperature air generated by a flat panel solar air collector to blow over the evaporation surface and accelerate interfacial evaporation.Meanwhile,utilizing the performance advantages of graphene oxide,a composite film of GO/PI/PTFE is prepared as a photothermal material to improve evaporation efficiency of device.Finally,the performance of the evaporation device is analyzed and verified through experiments.The research results show that the prepared GO/PI/PTFE composite film has stronger light absorption ability and better hydrophilicity.Under the conditions of blowing hot air with a speed of 4 m/s and a temperature of 65℃into the evaporation surface,and a solar irradiance of 1000 W/m~2,at 1800 s,the evaporation rate corresponding to the evaporation device with GO/PI/PTFE composite film but without hot air blowing is 1.22 kg/（m~2·h）.Compared with the pure water evaporation device,the evaporation rate is increased by 3.2 times and the evaporation efficiency is improved by 59.5%.The evaporation efficiency of the hot air blowing solar interface evaporation device is 88%,which is higher than that of pure water evaporation devices and non hot air blowing evaporation devices.Compared with pure water evaporation devices,the evaporation rate is increased by 5.5 times and the evaporation efficiency is improved by 68.0%.Hot air blowing can increase the evaporation capacity,thereby improving the evaporation efficiency of the evaporation device.The research results can provide theoretical and experimental basis for further research on improving the evaporation efficiency of hot air blowing solar interface evaporation devices.