The invention discloses a system and method for measuring electric leakage of a battery pack. The system comprises a to-be-measured module, a high-voltage output module, a detection module and a result display module, wherein the to-be-measured module comprises a virtual resistor (the mark is shown in the specification) which is formed between an outer wall end of a battery box and a shell end of the battery pack and is connected in series with the detection module; the high-voltage output module outputs high voltage into the detection module; the detection module feeds the detected voltage signal back to the result display module; the result display module processes the fed-back signal and outputs a final result. The insulation resistance between the battery pack and the battery box is detected, whether electric leakage exists in the battery pack can be rapidly and effectively judged, the detection result is accurate and high in detection efficiency, and the system is suitable for any scene in which whether a power storage battery has electric leakage danger. In addition, the system also has an alarm function, a user can be prompted to take protection measures, casualties and damages of other systems brought by the electric leakage are avoided, and the running safety is improved.