The utility model relates to the field of flue gas switching valves, in particular to an electric three-way switching valve. According to the electric three-way switching valve for sintering flue gas circulating, two valve plates are arranged in two air outlet pipelines respectively, used for controlling the air outlet pipelines to be opened or closed, and fixedly installed on a valve shaft in the mode of forming a certain angle. When one valve plate is at the closing position, the other valve plate is at the opening position. Pipe wall contact blocks are installed on the inner walls of the two air outlet pipelines respectively. When one valve plate is at the closing position, the valve plate makes contact with the pipe wall contact blocks and is locked through a locking device. An electric actuator and the locking device are installed outside a three-way valve body. The electric actuator is connected with the valve shaft in a driving mode. After the electric three-way switching valve is used, the leakage rate is smaller than 1%; the valve plate combination part can operate for a long time and is small in abrasion, resistant to scouring, flexible in motion, safe and reliable, dust accumulating and material blocking are avoided, long-distance control and automation operation can be achieved, and the valve is particularly suitable for the special working condition of sintering flue gas circulating.