Abstract: In the context of the continuous development of digitalization and smart power plant construction, it is necessary to carry out research and application of smart environmental protection technology for coal-fired power plant post-furnace environmental protection equipment. Research and application of smart environmental protection technology have been conducted based on the operation of environmental protection system mechanisms. By analyzing historical data of the system and comparing it with experimental data, predictive and data models have been established. Through unified monitoring, collaborative energy conservation, system warning, implementation of control strategy optimization, load linkage, and one-click start, as well as optimization modules of power supply secondary current and secondary voltage, operation mode optimization, load and outlet dust linkage, coordinated debugging and control of dust removal and desulfurization, and optimized control of electrostatic precipitator and pneumatic ash conveying, intelligent debugging and control of dust removal, ash conveying, and desulfurization by intelligent environmental protection technology have been achieved. The intelligent and digital improvement of the environmental protection system behind the boiler is realized, integrating the Internet, big data and other cutting-edge information technologies to create an intelligent operation technology service platform for the environmental island. This aims to reduce and eventually achieve unattended operation, and realize the innovative operation mode of "environmental protection, automatic energy conservation".