The utility model discloses a virtual work fence of a power transmission and distribution line. The virtual work fence comprises multiple cameras arranged on an iron tower of the power transmission and distribution line, and the multiple cameras have different shooting positions and realize omnibearing shooting of a site. The multiple cameras are connected with a video analysis server through a wifi and wireless router and transmit acquired images to the video analysis server. The video analysis server is connected with an on-site alarm circuit through a 3G network. The lens of each camera is additionally equipped with a polarizing film. A light supplementing set is arranged on the iron tower. The light supplementing set comprises a support. The support is equipped with three infrared light supplementing instruments. Every two adjacent infrared light supplementing instruments have an included angle of 90 degrees. The virtual work fence of the utility model is reasonable in structure and good in work effect; and the virtual work fence can monitor the power transmission and distribution line continuously in an all-weather manner.