Petrochemical engineering safe and environment-friendly gas sampling device

A petrochemical engineering safe and environment-friendly gas sampling device comprises a branch pipe valve and a sampling branch pipe with the tail end provided with a flange, the sampling branch pipe is connected to a main pipeline, the branch pipe valve is arranged on the sampling branch pipe and used for controlling the sampling branch pipe to be communicated with the main pipeline, and a sample discharging pipe is arranged at the tail end of the sampling branch pipe in a flange connection mode. A sampler of which the opening degree can be stably controlled is arranged on the side surface of the sample discharging pipe; a collecting bag is stably fixed at the tail end of the sample discharging pipe in a groove form; when the sampling container is connected to the sampler, the sampler effectively buffers and limits the sample gas in the main pipeline, so that the sampling container is prevented from being flushed off by high-flow gas flow, danger and environmental pollution are avoided, unstable front-sect