Ground screen corrosion evaluation method

The invention provides a grounding grid corrosion evaluation method which comprises the following steps: S1, equipment connection: connecting a pilot frequency alternating current source to the upper ends of two grounding lead-in wires of a grounding grid, so that the pilot frequency alternating current source and the grounding grid form a closed loop; the grounding lead-in wires are respectively connected with alternating current transformers; s2, power-on test: starting the pilot frequency alternating current source to enable the pilot frequency alternating current source to output; s3, data measurement and recording: S4, conclusion judgment: when an alternating current transformer cannot measure pilot frequency alternating current or a current signal is relatively weak, judging that a breakpoint or virtual connection exists in a lower lead between a corresponding grounding lead-in wire and a grounding grid; and S42, evaluation is performed according to the distribution characteristics, when the grounding g