A visulizer for pole hangs down straightness checks relates to the electric power system corollary equipment field, especially relates to the improvement of its sagging straightness visulizer. The utility model provides a structure is exquisite, convenient to use and portable, transportation, thereby the plumb line has a visulizer for pole hangs down straightness checks that higher straightness accuracy carries out directly perceived, accurate check to the straightness that hangs down of pole during the use. The visulizer still includes magnetic force sucking disc and tripod, magnetic force sucking disc fixed connection on the top of tripod, and be connected with the bottom detachable of box. The box includes roof, bottom plate, upward case festival, nowel save and at least one raising middle flask festival, roof fixed connection is at last case festival top, bottom plate fixed connection is in nowel festival bottom. The structure is exquisite, the principle is simple, has the characteristics that low in manufacturing cost and use cost are low, has splendid result of use and very good popularization meaning.