Waste gas sampling gun supporting frame

The utility model discloses an exhaust gas sampling gun support frame in the technical field of exhaust gas sampling gun support, which comprises a frame body, a threaded rotary drum is movably inserted in the middle surface of the top end of the frame body, the bottom end of the threaded rotary drum is rotatably connected with the inner bottom end of the frame body through a first rotating piece, and a brake device is arranged on the threaded rotary drum. A first screw matched with the threaded barrel is inserted into the threaded barrel in a threaded mode, a limiting device is arranged on the first screw, a mounting plate is connected to the top end of the first screw, a fixing base with the arc-shaped top face is connected to the mounting plate, a fixing through hole is formed in the center of the front face of the fixing base, and a positioning device is arranged in the fixing through hole. Supporting legs are fixedly arranged on the surfaces of the left end and the right end of the bottom of the frame bo