Impedance composite silencing elbow

The utility model relates to the field of silencing elbows, in particular to an impedance composite silencing elbow which comprises an elbow pipe, the top end of the elbow pipe is in butt joint with a first silencing pipe, the top end of the elbow pipe is in butt joint with a second silencing pipe, and skirt edges are fixedly connected to the outer sides of the elbow pipe, the first silencing pipe and the second silencing pipe. The outer side of the skirt edge located at the attaching position of the top end of the elbow pipe and the bottom end of the first hush pipe is slidably connected with a reinforcing anti-loosening buckle, exhaust pipes are arranged on the inner sides of the elbow pipe, the first hush pipe and the second hush pipe, the outer sides of the exhaust pipes are sleeved with positioning rings, the middle positions of the positioning rings are rotationally connected with rotating shafts, and the rotating shafts are arranged on the inner sides of the elbow pipe, the first hush pipe and the seco