Download control device based on USB (Universal Serial Bus)

The utility model provides a USB-based download control device, a first PCB download board is provided with a first USB socket and a first 4G module, a first idle pin on the first USB socket is connected with a first download control pin of the first 4G module, and a first USB customized download line comprises a first USB plug plugged with the first USB socket. The first USB plug comprises a second idle pin connected with the first idle pin, and the second idle pin is in short circuit with a power supply pin of the first USB plug; the second PCB download board is provided with a second USB socket and a second 4G module, a third idle pin on the second USB socket is connected with a second download control pin of the second 4G module, the second USB customized download line comprises a third USB plug plugged with the second USB socket, the third USB plug comprises a fourth idle pin connected with the third idle pin, and the fourth idle pin is connected with the fourth idle pin. And the fourth idle pin is in sh