This paper investigates the correlation between the peak pressure of a shock wave generated by underwater electrical wire explosion and the circuit parameters of the device: charging voltage, capacitance, and inductance. Simulations are conducted under varying conditions of charging voltages ranging from 5 to 10 kV, capacitances ranging from 0. 33 to 0.94 μF, and inductances ranging from 2.15 to 20 μH. We find that the peak pressure of the shock wave is proportional to the charging voltage and the square root of capacitance divided by inductance, which corresponds to the characteristic current. This discovery can be applied to regulate shock wave intensity by adjusting the circuit parameters of underwater electrical wire explosion device for diverse applications. This study also provides a base for predicting shock wave intensity in underwater electrical wire explosion under general circumstances.