The invention provides tension adjusting mechanisms on the two sides of a tensioning rope system traction system. Each tension adjusting mechanism comprises a rope, a traction friction wheel, a winding end tension adjusting device and an unwinding end tension adjusting device, wherein a winding end adjusting wheel of the winding end tension adjusting device is provided with a winding end pressuresensor, an unwinding end adjusting wheel of the unwinding end tension adjusting device is provided with an unwinding end pressure sensor, and a feedback control module is arranged between the windingend pressure sensor and the unwinding end pressure sensor. The tension on the tensioning wheel is monitored in real time by monitoring the winding end adjusting wheel and the unwinding end adjusting wheel in real time, so that the tension between a winding end container and an unwinding end container end can be controlled. According to the tensioning adjusting mechanisms, by the adoption of the simple structure, stress fluctuation caused by weight changes of ropes such as a balance rope or a tail rope in the lifting process is overcome, and particularly, the stress fluctuation of a main traction rope in the vertical lifting process is relieved, the service life of the main traction rope such as a lifting steel wire rope is prolonged, and the power distribution of the lifting system is optimized.