The invention discloses a charging system for a defibrillator, which belongs to the technical field of the protection and application of medical equipment and is used for solving the problems of incomplete equipment protective measure, low charging efficiency, low charging speed, low charging accuracy and the like existing in the conventional charging system for the defibrillator. The charging system comprises a charging control circuit, a driving circuit, a power supply, an energy converter, a metal oxide semiconductor (MOS) switch, a high-voltage diode, an energy storage capacitor, a primary current detection circuit, a secondary current detection circuit, an energizing frequency adjusting circuit, a charging speed control circuit, a first high-voltage sampling circuit, a digital converting circuit, a charging switch control circuit, a second high-voltage sampling circuit, a voltage comparison circuit, an energy setting circuit, a hardware shut-off circuit, a third high-voltage sampling circuit and an over-voltage shut-off circuit. The charging system provided by the invention solves problems existing in the conventional charging system for the defibrillator and can fully ensurethe safeties of patients and equipment in defibrillation treatment.