The invention provides an experimental device and method for restoring polluted soil through microorganisms. The experimental device comprises a bactericide adding groove, a soil shearing groove, heating belts, stirring equipment and water adding equipment. The soil shearing groove is formed in the upper portion of the bactericide stimulant adding groove. The outer surface of the soil shearing groove is wrapped with one heating belt. The outer surface of the bactericide stimulant adding groove is wrapped with the other heating belt. The water adding equipment is used for beating liquid in thebottom bactericide stimulant adding groove into the soil shearing device from bottom to top. The stirring equipment is used for increasing the porosity of soil in a soil shearing groove. A silk screenfiltering disc is arranged on the bottom of the soil shearing groove. The invention further provides a method for utilizing the device to complete restoring of the polluted soil through the microorganisms. The experimental device and method for restoring the polluted soil through the microorganisms can provide appropriate bacteria temperature and soil environment.