The invention discloses a step voltage and contact voltage wireless mapping system, which comprises a suit of wearable shielding clothes measurement device for measuring step voltage and contact voltage, a host, a display terminal and a uninterrupted power supply (UPS) device. The suit of wearable shielding clothes measurement device for measuring step voltage and contact voltage comprises a shielding clothes body for covering the whole body of a worker and a inter-voltage-electrode voltage measurement module arranged on the shielding clothes body, a watch-type display terminal, a contact voltage electrode, a right-foot step voltage electrode, a left-foot step voltage electrode, a wireless transmission and emission module and a digital-analog conversion unit. The system allows the measurement result thereof to accord with real step voltage and contact voltage situations under actual operating conditions on the premise of ensuring personal safety, and meanwhile, can draw test tracks of test personnel in a grounding grid region and test data of each point synchronously, thereby avoiding complexity of data processing after conventional test, and greatly improving data precision; and the system has a better popularization value.