The utility model relates to a self-tightening rope, belonging to a rope tool used in binding articles in daily production and daily life, and in high-altitude work such as fire-fighting rescue, climbing and hoisting. The self-tightening rope consists of a bourdon-tube-shaped hollow rope (1) and an air extractor (2), wherein one end of the bourdon-tube-shaped hollow rope (1) is a closed end (11), the other end of the bourdon-tube-shaped hollow rope (1) is communicated with the air extractor (2); negative pressure inside the bourdon-tube-shaped hollow rope (1) is controlled by the air extractor (2); a rubber layer for increasing friction or a raised rough surface layer is arranged on the surface of the bourdon-tube-shaped hollow rope (1); a soft and nonretractable metal material (5) is attached on the surface of a bourdon-shaped outer ring of the bourdon-tube-shaped hollow rope (1) for increasing flexibility and improving toughness of the bourdon-shaped rope when the negative pressure of the bourdon-tube-shaped hollow rope is subjected to deformation. Due to capability of realizing rapid binding and unbinding as well as self-tightening function after binding, the self-tightening rope is applicable to the application field of ropes requiring fast speed, convenience and reliability.