The invention provides a stay wire displacement measurement device, which comprises a stay wire (52) and a stay wire double-way guiding device, wherein the stay wire double-way guiding device comprises a first guiding mechanism (20) and a second guiding mechanism (30) which are fixedly arranged, the arc guide surface of the first guiding mechanism (20) is opposite to the arc guide surface of the second guiding mechanism (30), and a mounting space (40) is formed between the arc guide surface of the first guiding mechanism (20) and the arc guide surface of the second guiding mechanism (30), and the stay wire (52) passes through the mounting space (40) and is arranged on the first guiding mechanism (20) or the second guiding mechanism (30). According to the stay wire double-way guiding device of the stay wire displacement measurement device, the measurement range of the stay wire displacement measurement device is expanded, and the advantages of reduction in the length of the stay wire, simple structure, convenience for use and effective reduction in cost are achieved.