Welding wire safety guardrail capable of automatically adjusting height

The utility model discloses a welding wire safety fence capable of automatically adjusting the height, and belongs to the technical field of safety fences. The welding wire safety fence capable of automatically adjusting the height comprises a retention fence net and a movable fence net, and further comprises a top position frame which is arranged above the retention fence net, connecting and fixing frames are arranged below the two ends of the top position frame, the connecting and fixing frames are connected with the top position frame through bolts, and side position fence nets are arranged on the outer sides of the connecting and fixing frames. In order to solve the problems that the visibility of a lifting guardrail is relatively poor, a multi-section type lifting structure is prone to breaking down in the actual operation process, and once a single breast board breaks down, lifting and unfolding of the whole breast board can be affected, a fixed fence net is located above a movable fence net, and a mova