The invention relates to a tension spring protecting sleeve, which belongs to the technical field of large-scale movable electrical equipment tension spring protection. The technical scheme is characterized in that the tension spring protecting sleeve comprises a tension spring (1), an inner protecting sleeve (2), an inner protecting sleeve cover (3), an outer protecting sleeve (4) and an outer protecting sleeve cover (5), wherein both the inner protecting sleeve (2) and the outer protecting sleeve (4) are of hollow cylinder structures; the inner diameter of the outer protecting sleeve (4) is larger than the outer diameter of the inner protecting sleeve (2); the inner diameter of the inner protecting sleeve (2) is larger than the outer diameter of the tension spring (1); the inner protecting sleeve (2) sleeves on the tension spring (1); the outer protecting sleeve (4) sleeves on the inner protecting sleeve (2); one end of the tension spring (1) is fixedly connected with the inner protecting sleeve cover (3); the inner protecting sleeve cover (3) and the inner protecting sleeve (2) are in threaded connection; the other end of the tension spring (1) is fixedly connected with the outer protecting sleeve cover (5); and the outer protecting sleeve cover (5) and the outer protecting sleeve (4) are in threaded connection. The tension spring protecting sleeve provided by the invention has the beneficial effects that the tension spring can be prevented from being damaged, and the service life of the tension spring is prolonged.