In order to evaluate the distribution characteristics of submarine underwater corrosion related steady electric field, starting from the mechanism of submarine underwater corrosion related steady electric field, a forward model of submarine underwater corrosion related steady electric field was established based on the equivalent point-type current source theory. And the current intensity of the equivalent point-type current sources was solved by Tikhonov regularization according to the measured electric field data. The effectiveness of the proposed method was verified by commercial finite element software COMSOL. The results show that when inverting the electric field value from depth of 38 m to a water depth of 42.5 m and 33.5 m, the relative root mean square error, maximum relative error, and peak to peak relative error do not exceed 0.06. Even if the calculated depth reaches 45 m, the relative root mean square error is still less than 0.21. When the noise standard deviation is 0.1 times the maximum value of the actual electric field, the inversion error is still less than 0.1. This algorithm has strong noise resistance and high accuracy, can be used in engineering practice.