Atmospheric storage tank closed sampler

The utility model provides a closed sampler of a normal pressure storage tank, which comprises a storage tank, a circulating sampling pipeline, a sealed sampling box and a sealed sampling bottle, the upper part of the storage tank is provided with a sample outlet and a sample inlet, the sample outlet is positioned below the sample inlet, one end of the circulating sampling pipeline is communicated with the sample outlet, and the other end of the circulating sampling pipeline is communicated with the sample inlet. The circulating sampling pipeline is partially positioned in the sealed sampling box, a circulating sampling interface is arranged on the circulating sampling pipeline positioned in the sealed sampling box, and the sealed sampling bottle is arranged in the sealed sampling box and is detachably connected with the sampling interface through a sampling pipe. In the daily sampling process of the atmospheric storage tank, sampling is carried out through the closed sampler, no sampling product is left afte