At present, heavy metal pollution mainly composed of cadmium(Cd), lead(Pb), zinc(Zn), etc. is becoming increasingly severe, which greatly endangers the development of industry and agriculture and the health of people’s lives. Composite heavy metal ion pollution is the main form of pollution in industrial and agricultural production, and research on the remediation of composite heavy metal contaminated soil has practical significance. In addition, there is relatively little research on the use of acetic acid for the remediation of composite heavy metal contaminated kaolin, and its intrinsic remediation mechanism and reaction mechanism still need to be elucidated. In view of this, taking indoor simulated cadmium lead zinc composite polluted kaolin as the research object, electric remediation technology was adopted and different concentrations of acetic acid solution were used to remediate the composite heavy metal polluted kaolin. Combined with various testing methods, the internal remediation mechanism of polluted soil in the electric remediation process was deeply explored by analyzing the changes in electroosmotic flow, pH, conductivity, residual heavy metal ion and current.