Fluid sampling device

The embodiment of the utility model discloses a fluid sampling device, the fluid sampling device provided by the embodiment of the utility model comprises a sampling tank, a pressure adjusting assembly and a fluid sampling pipe, the pressure adjusting assembly is correspondingly instructed to perform air exhaust, a negative pressure environment is formed in the sampling tank, and the fluid sampling pipe extends below the liquid level of a fluid box; the liquid to be measured enters the sampling tank through the fluid sampling pipe under the action of pressure, and after sampling is completed, the pressure adjusting assembly stops air exhaust corresponding to an instruction, and a single sampling process is completed. According to the fluid sampling device provided by the embodiment of the invention, single sampling is completed, the pressure adjusting assembly stops exhausting, the internal and external pressures of the sampling tank are balanced, the to-be-detected liquid in the fluid sampling pipe falls bac