Abstract: In view of problem that turn-off time of emission current of transient electromagnetic transmitter is overlong caused by parasitic inductance of the transmitter coils, a novel fast turn-off circuit was designed. During the decline of transmitting current, the fast turn-off circuit uses transistors to provide an additional new discharge circuit, which takes advantages of its large resistance and low discharge time constant to realize quick turn-off of the transmitting current. The results of simulation and experiment show that the novel circuit can decrease the turn-off time of transient electromagnetic transmitter effectively with high stability.