The utility model belongs to fluid production technology sample field, concretely relates to automatic sampling device of fluid material, include that horizontal T type pipe, pneumatic valve, inlet pipe, sample collect case, overflow pipe, washing water pipe, go out an appearance pipe, blow off pipe and solenoid valve, the inlet pipe is being connected to horizontal T type pipe upper end, and the inlet pipe is being connected the sample and is being collectd the case, and the sample collects the case and comprises a cylinder section of thick bamboo and a toper section of thick bamboo, is connecting the washing water pipe on the cylinder section of thick bamboo, and cylinder section of thick bamboo upper end side is provided with the overflow pipe, and toper section of thick bamboo below is provided with out the appearance pipe, is provided with the blow off pipe to the side of the toper section of thick bamboo below. The utility model relates to a with low costs, easy maintenance can carry out uninterrupted maintenance, degree of automation is high, can realize timing, ration sample, has advantage unattended, the sample standard, has guaranteed the stability and the sample accuracy of taking a sample, has improved the production management and control.