In order to study the influence of surface wettability of copper mesh on oil-water separation performance,the superhydrophilic copper net treated by metal oxidation method was used as oil-water separation medium to investigate the change of the contact angle between water in air and oil in water before and after treatment.The effects of different oil samples,different oil volume fractions and different filter mesh numbers on the oil-water separation performance were analyzed.The diffusion of water droplets in air and the aggregation of oil droplets in water were analyzed by means of Cell Registers function.The results show that the Cu(OH)2 microstructures formed on the surface of the treated copper mesh are super-hydrophilic in the air,and the hydrophobicity increases with the increase of the number of copper mesh.Higher oil-water separation efficiency can be obtained with the larger density difference and viscosity difference of oil-water two phases,and the larger oil volume fraction and copper mesh number.The water droplet spreading coefficient of hydrophilic surface increases gradually with time,while the oil droplet spreading coefficients of underwater oleophobic surface first increase slowly and then remains stable.The application of superhydrophilic-underwater oleophobic copper mesh has a good development prospect for improving and strengthening the oil-water separation performance.