Convenient circuit structure for supporting updating of industrial controller

The utility model belongs to the technical field of controller upgrading circuits, and particularly relates to a convenient industrial controller circuit structure supporting updating. The USB interface circuit comprises a USB interface, a USB driving chip, a fuse and a resistor. A first pin of the USB interface is connected with a 5V power supply through a fuse, and a second pin and a third pin of the USB interface are respectively connected with a resistor and a resistor and then are connected with a first pin and a third pin of the USB driving chip for data input. A fourth pin and a sixth pin of the USB driving chip are used for outputting; the USB flash disk is adopted for firmware updating, the maintenance cost of a client is reduced as much as possible, the client is allowed to update by himself/herself due to the usability of operation, the after-sales maintenance cost of an equipment manufacturer and a controller manufacturer can be greatly reduced, the time cost for the client to wait for maintenance