Device for collecting soil breathing gas and gas collecting method

The invention relates to a device for collecting soil breathing gas. The device comprises a glass bottle, a bottle cap which is installed on the glass bottle and used for sealing the glass bottle anda gas guide pipe penetrating through the bottle cap to communicate the interior and exterior of the glass bottle; a soil sample to be detected is placed in the glass bottle; the gas guide pipe comprises a sampling guide pipe, a gas inlet guide pipe and a gas outlet guide pipe, the gas inlet end of the gas inlet guide pipe, the gas outlet end of the gas outlet guide pipe and the gas outlet end of the sampling guide pipe are located outside the glass bottle, the gas outlet end of the gas inlet guide pipe extends into the bottom in the glass bottle, and the gas inlet end of the gas outlet guide pipe and the gas inlet end of the sampling guide pipe are located at the upper part in the glass bottle; the gas inlet end of the gas inlet guide pipe, the gas outlet end of the gas outlet guide pipe and the gas outlet end of