A safety monitoring system for realizing live-line operation in a vision-blind state comprises a main camera, an auxiliary camera, wireless headsets, a wireless router and a laptop. The main camera is arranged at a side of an operation bucket via a telescoping support. The main camera can rotate in the vertical direction and in the horizontal direction on the telescoping support. An outer side of the main camera is provided with LED infrared lamp beads arranged in a circle, and LED lamp beads distributed in concentric circles are arranged outside the LED infrared lamp beads. The auxiliary camera is arranged on a safety cap of a worker in the operation bucket. The wireless headsets are worn by the worker in the operation bucket and a ground work leader respectively. The wireless router receives data obtained by the main camera and the auxiliary camera and sends the date to the laptop for real-time display. The laptop is externally connected with a large-power wireless local area network card.