Wet chlorine closed sampling device

The utility model discloses a closed sampling device for wet chlorine. The closed sampling device comprises a medium inlet pipeline, a medium outlet pipeline, a sampling bottle and a three-way ball valve, the sampling bottle has the advantages that 1, after sampling is completed, the sampling bottle can be conveniently and quickly taken down, residual gas in a pipeline is prevented from leaking outwards, online detection is not needed, the safety and reliability of sampling are ensured, and operation is convenient; 2, the sampling bottle is pressurized by the gas pressure pump, so that complete replacement can be ensured in the replacement process, and the influence on the sampling reliability due to incomplete replacement is avoided; in the sampling process, a large amount of wet chlorine can be stored, and the sampling accuracy is improved; meanwhile, the replacement and sampling time can be shortened; and 3, the parts of the medium inlet pipeline, the medium outlet pipeline, the sampling bottle, the three-