The high voltage driving and intrinsic safety cannot be combined when the ultrasonic transducer is used to monitor the drilling condition of kilometer directional drilling machines. To address this issue, an intrinsically safe ultrasonic transmitting circuit based on energy storage inductance is proposed. The basic principle of the transmitting circuit is introduced, and the effects of the equivalent impedance of the transducer and the dynamic resistance of the regulator on the discharge time and exciting pulse width of the energy storage inductance are studied theoretically. The internal and output intrinsic safety characteristics of transmitting circuit are analyzed. Then, a judgment standard of intrinsic safety parameters and a parameter calculation method of high voltage intrinsically safe ultrasonic transmitting circuit are illustrated. Experimental results show that the exciting pulse width of 200 V amplitude can reach 2 ~ 3 μs in the range of design parameters, which is greater than the design value of 1. 5 μs. The measured energy storage inductance current is 0. 9 A and the equivalent capacitance of the transducer is 1. 05 μF. The current is smaller than 1 A and capacitance is smaller than 100 μF under intrinsically safe condition. Therefore, the circuit parameters obtained by the proposed method can meet the intrinsic safety requirements under the output of high voltage exciting pulse.