Pull rope belt

The invention provides a pull rope belt, wherein the degree of tightness of an acting object is controlled through application of different force bearing situations between multiple single knots and rope belts passing the single knots and through changing of position relations among parts of the rope belts. The pull rope belt is characterized in that three or more than three single knots are tied successively on a rope belt a; one rope belt head of a rope belt b successively passes a rope belt ring formed by each single knot on the rope belt a, wherein the course is started from one of the two single knots located on the two farthest ends of the rope belt a; and the other rope belt head of the rope belt b does not pass through the single knots. The pull rope belt is connected to the acting object properly; according to the characteristic that the rope belts on two ends of the single knot are tightened due to pull force in opposite directions, the rope belt b is controlled to pass through the rope belt knots on the rope belt a through slide friction force and static friction force between the multiple single knots and the rope belts passing through the knots; and the length of the rope belts of the rope belt b located on both sides of the rope belt knot can be changed, so that the tightness degree of the acting object can be controlled.