Abstract: Biomass carbon with porous structure can be used as a photothermal material for interface photothermal evaporation. In this paper,a variety of biomass carbons（carbonized wood block,durian shell and passion peel）with different morphologies and porous structures are used to conduct interface photothermal evaporation experiments. The research results show that the interfacial photothermal evaporation can achieve higher photothermal utilization efficiency due to good thermal limitation,and the complex surface morphology and porous structure can further improve the evaporation rate and photothermal utilization efficiency in the biomass carbon.Among them,the carbonized passion peel shows the best evaporation performance:under a standard sun,the evaporation rate reaches1.27 kg/（m~2·h）,and the photothermal utilization efficiency is 88.6%. At the same time,the desalination rate of biomass carbons for artificial seawater with a salinity of 3% are higher than 99.5%. Therefore,the interfacial photothermal evaporation based on biomass carbon has a good application prospect for desalination.