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 . <EOS>