The quality of fuel hydrogen has an important impact on the performance and life of the fuel cell engine, and the hydrogen must be sampled and tested in the process of hydrogen use to ensure that the fuel hydrogen used meets the use standards of the fuel cell engine, and the portable gas hydrogen sampler is divided into two kinds: 35Mpa and 70Mpa, which are sampled directly from the hydrogen refueling port of the hydrogen refueling machine, and the sampling is safe and reliable, and the sampling is representative.