Chest expander with length convenient to adjust

The utility model discloses a chest expander convenient to adjust length, and relates to the technical field of fitness equipment, both the upper end and the lower end of an adjusting piece are provided with slideways, two sliding blocks are slidably connected in the slideways, the inner sides of the slideways are provided with adjusting lead screws, the left ends of the adjusting lead screws are fixedly connected with rotary knobs, and the left ends of the adjusting lead screws are fixedly connected with the rotary knobs. The right end of the adjusting lead screw penetrates through the left side wall of the adjusting part and is rotationally connected with the right side wall of the adjusting part, the adjusting lead screw is rotationally connected with the left side wall of the adjusting part, the thread directions of the left end and the right end of the adjusting lead screw are opposite, and the adjusting lead screw is in threaded connection with a connecting plate. During use, the adjusting lead screw is