The invention discloses a live working ground potential safety distance warning device which comprises a device body made of insulating materials. Safety distance warning bottom surfaces are arranged at the bottom of the device body, a length-adjustable insulating rope capable of determining a safety distance according to the adjusted length is connected to each of the left side and the right side of the device body, a self-locking hook hooked to a live lead above a working point is arranged at the upper end of each insulating rope, the device body comprises main arc beams in left-right parallelism and insulating cross bars connected between the main arc beams, and the safety distance warning bottom surfaces are arc-shaped beams tangent to the main arc beams. The device has the advantages that safety distance warning is achieved, working personnel can visually see the device, and the positions of the bottom surfaces of the device are the safety distance under a corresponding voltage grade; as long as the working personnel does not exceed the bottom surfaces of the device, the safety distance can be kept, electric shock accidents can be avoided, and working safety can be guaranteed.