Method for evaluating corrosion health state of buried metal pipe interfered by power transmission and transformation equipment

The invention discloses a method for evaluating a corrosion health state of a buried metal pipe interfered by power transmission and transformation equipment. The method is characterized by comprisingthe following steps: 1) measuring density of cathode protection current; 2) calculating density of alternative current according to a calculation equation as shown in the description, in the equation, Uac is an alternative-current interference voltage with the unit of V; iac is the density of the alternative current with the unit of A/m ; rho is soil resistance with the unit of omega*m; d is the diameter of a damage point with the unit of m; 3) calculating and collecting related influence data of the density of the alternative current and a pipe corrosion velocity under different cathode protection conditions, performing fitting so as to obtain a pipe corrosion health state influenced by power transmission and transformation equipment, performing fitting so as to obtain a function relationship of cathode protecti