Abstract: In order to solve the problem of difficult protection of the inner wall of small diameter pipes, an electric explosion spraying device for the inner wall of the pipeline was independently developed, and the pipe spraying test on the inner surface of the carbon steel pipe with an inner diameter of φ62 mm was independent developed. The 2Cr13 martensite stainless steel coating was prepared. SEM, EDS, XRD, hardness testing, friction and wear testing, and electrochemical testing were used to analyze the macroscopic and microscopic morphology, phase composition, and performance of the inner wall coating of the pipe. The results show that the self-developed pipe inner wall spraying device operates stably. The metallurgical binding interface is formed between the coating layer and the matrix. The coating is a typical nanocrystalline structure. The coating hardness is high, and has good wear resistance and corrosion resistance.