The utility model discloses a live-line work on-site dressing safety monitoring device. The live-line work on-site dressing safety monitoring device comprises an image acquisition module, an image processing and safety monitoring module, a data transmission module, an alarm module and a power supply module, wherein the image acquisition module comprises a camera, a CCD acquisition chip connected with the camera, and an A/D data conversion circuit and a CCD timing sequence drive circuit which are connected with the CCD acquisition chip; the image processing and safety monitoring module comprises an FPGA chip and a memory connected with the FPGA chip; the data transmission module comprises a data compression chip and a data transmission chip; and the alarm module comprises an alarm lamp and a buzzer which are connected with the FPGA chip. When the image processing and safety monitoring module triggers an alarm, an early warning is sent to working personnel. Compared with a conventional monitoring device, the live-line work on-site dressing safety monitoring device is simple in structure, small in size, convenient to use, maintain and move, and high in data transmission speed.