The invention discloses an electric reactor air flue inner wall coating method and coating equipment thereof. The coating method and the coating equipment adopt the mode of injecting a coating material from the bottom of an electric reactor air flue cavity, and coating of the inner wall of an electric reactor air flue can be achieved. According to the coating method, the coating material continuous flowing mode is adopted in the whole process, bubbles in the coating material are not prone to occurring, the quality of a coating layer can be improved, the coating efficiency is improved, and thelabor intensity is relieved; and the situation that the coating material makes contact with air can be avoided, the coating material can be effectively and repeatedly utilized, the using amount of thecoating material in the coating process is decreased, and the coating cost is reduced. The electric reactor air flue inner wall coating method and the coating equipment thereof can be suitable for coating operation of channel inner walls different in size and cross section and even suitable for coating operation of channel inner walls with special-shaped cross sections, and have good universalityand market application value.