Sampling device for chemical waste gas detection

The utility model discloses a sampling device for chemical waste gas detection, which relates to the technical field of gas detection sampling and comprises a connecting cylinder, a gas inlet pipe and a gas outlet pipe are mounted at the bottom end of the connecting cylinder, one-way valves are mounted on the gas inlet pipe and the gas outlet pipe, an inner cylinder is sleeved on the inner wall of the connecting cylinder, and a gas outlet pipe is mounted on the inner cylinder. A piston plate is connected to the inner wall of the inner cylinder in an up-down sliding mode, a push rod is fixedly connected to the top end of the piston plate, a connecting handle is fixedly connected to the top of the push rod, and a connecting plate is detachably connected to the bottom end of the piston plate; the bottom end of the inner cylinder is fixedly connected with an inner insertion pipe inserted into the inner wall of the air inlet pipe, and the outer wall of the inner cylinder is provided with a guide groove unit. Accor