The invention discloses a method for obtaining parameters of a transformer based on a liquid electric pulse production increase device. The method comprises a step of setting an inner diameter and anouter diameter of a magnetic core, the ratio of the transformer, the effective value of primary current of the transformer, winding current density, the maximum working magnetic density of the transformer and the maximum primary volt-second product of the transformer according to the output voltage of a frequency converter, the type of the magnetic core, the operating temperature of the transformer, the breakdown voltage of an oil-water mixture and the requirements of the liquid electric pulse production increase device, a step of initializing the number of the magnetic cores, a step of calculating sectional areas of primary side winding and secondary winding wires, the effective sectional areas of the magnetic cores, the number of turns of a primary winding and the number of turns ofa secondary winding, and a step of calculating a window utilization factor, stopping calculation if design requirements are satisfied, otherwise updating the number of the magnetic cores and repeatingthe above steps. The invention comprehensively considers the volume size of the transformer, the high-temperature resistance characteristics and the adaption to complex waveform voltage excitation factors, and the design method of the parameters of the transformer based on the liquid electric pulse production increase device is more applicable.