Steel wire rope tensioner of friction winch

The invention provides a steel wire rope tensioner of a friction winch, which comprises a stander, a friction expansion cylinder, a driving mechanism and a tension mechanism. The friction expansion cylinder is wound with a steel wire rope which is arranged at the same side of an in-out rope by means of single layer; the driving mechanism comprises a large gear, a middle idle wheel and a small gear; the power is transmitted to a driving shaft through the large gear, the middle idle wheel and the small gear; the tension mechanism comprises the driving shaft as well as an upper control shaft, a lower control shaft and a double-position rod and double-action oil cylinder which are formed into a double-swinging rod structure; the upper control shaft and the lower control shaft are provided with a friction device which consists of a guide wheel, a rim, a friction disc and an adjustable spring; a conical surface wedge-shaped match structure is formed between the friction disc and the rim; and the horizontal center d