In view of the problems of high moisture content of paint slag,incomplete floating and easy to block the equipment pipeline in the spray painting circulating water system,the spray painting circulating water process is optimized,which reduces the impact of paint slag on the environment,improves the production efficiency of spray painting enterprises,and studies the key system of slag removal and purification process.The results show that the slag removal purification process has the characteristics of convenient operation and use,high slag removal efficiency,and low economic cost,which meets the needs and requirements of the spray industry.