The utility model discloses a gas sampling device for environment measuring, including box, piston, first rotation membrane, second rotation membrane, first gear, second gear, handle, connecting rod, connecting piece, sampling head, flexible pipe, bellows, connecting pipe, receiving flask, outlet duct, first valve, second valve, be equipped with inlet port, venthole, connecting hole on the box, be equipped with the mounting hole on the roof of box, be equipped with in the box that first hold the chamber and the second holds the chamber, the first intracavity that holds is arranged in to the piston, and the piston is connected with the box is portable, inlet port, connecting hole all are connected with the first chamber that holds, and inlet port, connecting hole lie in same one side of piston, connecting hole, venthole all hold the chamber with the second and are connected, the first intracavity that holds is arranged in to first rotation membrane, and the first end of first rotation membrane is articulated with the box, and the second end of first rotation membrane is used for sealing or opening the inlet port for free end, first rotation membrane.