Fluid sampling device and system

The invention discloses a fluid sampling device, which comprises a sampling barrel and a small storage tank, wherein the small storage tank is connected with a fluid inlet pipe through a main pipe; the main pipe is provided with a first control valve and a second control valve; the sampling barrel is connected on the main pipe between the first control valve and the second control valve through abranch pipe; and the branch pipe is provided with a third control valve. In addition, the invention also provides a fluid sampling system. The fluid sampling device and the fluid sampling system provided by the invention can solve the contradictions that the continuously sampled fluid sample is not excessive and the pipes are not blocked, and fulfill the purpose of real-time monitoring.