Air sampling bubble tube

The utility model discloses an air sampling bubble tube which comprises a cover body, an air inlet assembly, an air outlet pipe and a tube body with an opening in one side, and the tube body is used for containing gas absorption liquid. The cover body covers the opening and is in sealed connection with the inner wall of the opening; the gas inlet assembly and the gas outlet pipe penetrate through the cover body and extend into the pipe body, the gas inlet assembly and the gas outlet pipe are in threaded connection with the cover body, one end of the gas inlet assembly extends into gas absorption liquid, the gas outlet pipe is located above the gas absorption liquid level, and the gas outlet pipe is used for being connected with a constant-flow gas pump. The sampling device is used for sampling to-be-detected substances in air, the constant-flow air pump enables negative pressure to be formed in the pipe body, after air is introduced into gas absorption liquid through the air inlet assembly, the to-be-detected