The utility model discloses a walk line, traditional thread binding putting of meter suitable for engineering is on - -spot, the device include the protective housing and set up two meter line knot structures walking the line knot structure and be used for measuring protection device's inlet wire, the condition of being qualified for the next round of competitions respectively in the protective housing, count the line knot structure for two and set up in the both sides of walking the line knot structure, the position that corresponds two meter line knot structures on the protective housing is equipped with the opening that supplies the line to pass in and out respectively, and the line constructs, walks line knot structure and another meter line knot structure through a meter line knot in proper order, and the protective housing is stretched out from the opening that corresponds respectively in the both ends of line. To walk that line knot constructs, meter line knot constructs together integratedly, can effectively reduce the volume of whole device, reduces the device at the area at scene, the protection expects much, convenient to detach installation simultaneously. Through two meter line knot structures, can realize into, measure when being qualified for the next round of competitions, the quantity contrast of guarantee, being qualified for the next round of competitions can be at a within range equitable relatively for the redundancy that neither produces the line in the device is piled up, the excessive tensioning of disappearance line again.