Sampling structure of reduced pressure distillation system

According to the sampling structure of the reduced pressure distillation system, the upstream end of a first pipeline is used for being connected with a liquid outlet of a condenser of the reduced pressure distillation system, the downstream end of the first pipeline is used for being connected with a fraction collecting tank, a first valve and a second valve are arranged on the first pipeline, and the upstream end of a second pipeline is connected with the first pipeline and located between the first valve and the second valve; the downstream end is connected with a sampling and collecting tank, an emptying valve is arranged at the top of the sampling and collecting tank, a third valve and a fourth valve are arranged on the second pipeline, an emptying pipeline is arranged on the first pipeline, is located at the downstream of the first valve and is located at the upstream of the connecting position of the second pipeline and the first pipeline, and the emptying pipeline extends upwards and is controlled to