The utility model relates to a power equipment, more specifically relates to a portable dolly emergency power source. Including the box, its characterized in that, the box in be equipped with online uninterrupted power source, online uninterrupted power source one end is connected with mains input terminal, one end with exchange the output and be connected, online uninterrupted power source include UPS module, charging panel, battery, the UPS module is connected to form by isolation module, rectifier module, filter module, contravariant module, isolation module, static switching module, inductance module, and wherein static switching module is connected with mains input terminal, charging panel one end connection battery, and a termination is between filter module and contravariant module.Realize the real portability and the characteristics of quick travel, satisfy the device power down who inserts, need the requirement of telegram in reply fast.