The invention discloses a dynamic voltage restorer, which comprises a secondary loop control switch, a signal collector, a switching power supply, a controller, a power module, a filter loop, a super capacitor, a grounding bus bar, a cabinet body, an incoming line loop, an operation button, a liquid crystal touch screen, a power utilization system, an inverse parallel silicon controlled rectifier, an H-bridge inverter, a load, a direct-current chopped-wave boost circuit, an electronic switch and a release resistor. The secondary loop control switch, the signal collector, the switching power supply, the controller, the power module, the filter loop, the super capacitor, the grounding bus bar and the incoming line loop are arranged in the cabinet body. A cabinet door is arranged on the cabinet body. The operation button and the liquid crystal touch screen are arranged on the cabinet door. The controller and the reverse parallel silicon controlled rectifier are connected between the power utilization system and the load. The H-bridge inverter is connected between the two ends of the reverse parallel silicon controlled rectifier. The H-bridge inverter is connected with the direct-current chopped-wave boost circuit. The direct-current chopped-wave boost circuit is connected with the super capacitor. The cabinet door is provided with a fingerprint unlocking device and a wireless communication unit.