A new technology for inner coating was introduced,the equipment composition and working principle of the new technology solution were detailed in detail,the key equipment internal suction coating system was described in detail.Summarize the effects of temperature,rotational speed,and powder supply time on the coating of steel pipes during internal coating,and form conclusions based on experimental data.By comparing the technical performance of similar products and demonstrating their advantages,new ideas were provided for the internal coating production of domestic steel pipe enterprises.