The invention relates to a method for testing difference between different grounding materials and soil contact performance. A metal grounding body A and a graphite-based flexible grounding body B aremanufactured separately, the grounding bodies are placed in the middle of a metal backflow pole, simulated soil is filled around, the resistivity of the simulated soil is measured through a quadrupole method, the resistance of the simulated soil is calculated, the resistance values of the grounding models of the A and B materials obtained by the test are combined, the contact resistance among themetal reflow pole, the metal materials and the simulated soil is obtained, and the difference of the contact resistance between the different A and B material grounding bodies and the simulated soilis obtained. According to the device and the method provided by the invention, the installation and disassembly of the metal backflow pole are facilitated, the replacement of soil is simulated, the applicability is high, the operation is simple, and the test efficiency can be effectively improved.