The invention belongs to the field of an environment protective control, which particularly relates to an electric dedusting control system and a control method thereof; the invention is essentially applicable to the fields such as the power supply system, cement, metallurgy, nonferrous metals and chemical industries, including a central control system, an upper machine set and a lower machine set; the industrial Ethernet based on the TCP/IP protocol is adopted among upper computers in the upper machine set and between the upper computers and lower computers, the lower machine set is connected with the central control system by a switch software Ethernet, the central control system is taken as a monitoring control terminal to design, alter and debug the operation of the system in the upper computer image monitoring control terminal software; the electric dedusting control method includes a fan control, an evaporation low temperature control, an electric field control, a rapping control, a changing-over station control and a gas cold control. The environment protective control of the invention has high degree of automation, low operation cost, small electric energy consumption, convenient maintenance and management and relatively high dedusting efficiency.