The utility model relates to a movable power efficiency detection system. The system comprises a modified vehicle, a vehicle-mounted master station platform, and an energy efficiency detection device. The vehicle-mounted master station platform comprises a database server, a disk memory array, a Web server, an application program server, an energy efficiency data acquisition server, and a switch. The energy efficiency detection device comprises energy efficiency data monitoring devices, energy efficiency data acquisition terminals, an energy efficiency data concentration terminal, a repeater, and hand-held energy efficiency data additional acquisition devices. The vehicle-mounted master station platform is disposed in the modified vehicle. The energy efficiency detection device communicates with the vehicle-mounted master station platform through a wireless manner. The power efficiency detection system of a device is beneficial for an efficiency detection technical staff to detect operating status data and energy efficiency data of electrical equipment of an energy consumption company more comprehensively. The system uses an acquisition server to record detected equipment information, status information, and energy efficiency data information in a unified manner, providing convenience for deep mining and analysis of data.