The distribution map of soil corrosion levels is of great significance for guiding the differentiated anti-corrosion design, material selection, and operation and maintenance strategies of power grounding systems. However, the existing research on soil corrosiveness evaluation in China often has problems such as insufficient data density, reliance on a single evaluation method, or limited spatial interpolation accuracy. As a result, the drawn distribution maps are difficult to truly reflect the actual corrosion situation. This study combines the buried sheet method and the eight-index method to evaluate the soil corrosion levels of 114 substations in 11 regions of Zhejiang Province, China. The inverse distance weighted (IDW) spatial interpolation technique is used to draw the high-precision distribution map of soil corrosion levels for power grounding materials in Zhejiang Province for the first time. The research results can provide key basic data support for the differentiated anti-corrosion design, selection, operation, and maintenance of grounding materials for power equipment and other facilities in this region in the future.