The utility model discloses a last motion of thread tension measuring device, including rack device, rack device on penetrate and install 2 guide arms, rack device and gear engagement link to each other, the guide arm be the hexagon head by the head end, the middle polished rod that be, the integrative manufacturing of terminal section bar for the threaded rod forms, the polished rod on the cover spring is equipped with, the polished rod on the cover rack device is equipped with. The utility model has the characteristics of simple structure is reasonable, and convenient to use is reliable, low cost, and work efficiency is high, and measurement accuracy is high, be favorable to being used for in batches the production line.