Double-well swing arm pumping unit

The invention relates to a double-well swing arm pumping unit which comprises a main support; the support is fixe don a foundation; a balance bar is connected with the support; a rope hanging device is connected with pumping rods; a swing arm is fixed on the support; a rope tightening device is arranged on the swing arm; a No.1 guide wheel is arranged on the swing arm, and a No. 2 guide wheel is arranged on the support; a combined tension rod is connected with the support and the swing arm; a friction wheel, a clutch and the guide wheels are arranged on a driving device; the friction wheel is connected with the guide wheels; the rope hanging device, the No. 1 guide wheel, the friction wheel, a combined counterweight and the rope tightening device are connected; the No. 2 guide wheel, a No. 3 guide wheel and the swing arm are connected; the driving device drives the pumping rods on both sides to move; when a single wheel is repaired, the clutch on the driving device swings the swing arm on a well repairing sid