A system for controlling LED lightbox power supplies, the system comprising: - a plurality of LED light bars; - a lightbox internally equipped with said plurality of LED light bars; - a plurality of LED lightbox power supplies disposed inside the lightbox, wherein all the LED lightbox power supplies are connected in series with one another via the 485 communication bus; - a wireless communication device connected with the plurality of LED lightbox power supplies via the 485 communication bus and mounted inside the lightbox; - a gateway device adapted to wirelessly connect with the wireless communication device and to upload acquired data to a cloud server, wherein the gateway device is arranged outside the lightbox; - a sensor set connected in a wired manner with the wireless communication device and arranged on an outer wall of the lightbox; characterized in that each of the plurality of LED lightbox power supplies is connected with a respective one of the plurality of LED light bars and in that each of the plurality of LED lightbox power supplies comprises: a conversion circuit adapted to convert a serial port signal into a 485 communication signal, a voltage detection circuit adapted to detect an output voltage of the LED lightbox power supply, a current detection circuit adapted to detect an output current of the LED lightbox power supply, a microprocessor adapted to process detection results of the voltage detection circuit and the current detection circuit, and an independent supply circuit connected with the microprocessor to ensure independent operation of the voltage detection circuit and the current detection circuit. - a plurality of LED light bars; - a lightbox internally equipped with said plurality of LED light bars; - a plurality of LED lightbox power supplies disposed inside the lightbox, wherein all the LED lightbox power supplies are connected in series with one another via the 485 communication bus; - a wireless communication device connected with the plurality of LED lightbox power supplies via the 485 communication bus and mounted inside the lightbox; - a gateway device adapted to wirelessly connect with the wireless communication device and to upload acquired data to a cloud server, wherein the gateway device is arranged outside the lightbox; - a sensor set connected in a wired manner with the wireless communication device and arranged on an outer wall of the lightbox; characterized in that each of the plurality of LED lightbox power supplies is connected with a respective one of the plurality of LED light bars and in that each of the plurality of LED lightbox power supplies comprises: a conversion circuit adapted to convert a serial port signal into a 485 communication signal, a voltage detection circuit adapted to detect an output voltage of the LED lightbox power supply, a current detection circuit adapted to detect an output current of the LED lightbox power supply, a microprocessor adapted to process detection results of the voltage detection circuit and the current detection circuit, and an independent supply circuit connected with the microprocessor to ensure independent operation of the voltage detection circuit and the current detection circuit. a conversion circuit adapted to convert a serial port signal into a 485 communication signal, a voltage detection circuit adapted to detect an output voltage of the LED lightbox power supply, a current detection circuit adapted to detect an output current of the LED lightbox power supply, a microprocessor adapted to process detection results of the voltage detection circuit and the current detection circuit, and an independent supply circuit connected with the microprocessor to ensure independent operation of the voltage detection circuit and the current detection circuit.