The invention belongs to the field of beam tube monitoring, and particularly relates to a positive pressure sampling system. The positive pressure sampling system comprises a pressure pump, a pressure relief device and an automatic filtered water drainer. An inlet of the pressure pump is connected with a gas inlet, and an outlet of the pressure pump is connected with a gas inlet of the pressure relief device. A gas outlet of the pressure relief device is connected with the gas inlet end of the automatic filtered water drainer. The gas outlet end of the automatic filtered water drainer is connected with a gas outlet. A check valve is installed on a pipeline between the gas outlet and the gas outlet end of the automatic filtered water drainer. Remote and rapid conveying of gas of the beam tube system is achieved, gas mixed pollution can be avoided, and the monitoring result is ensured; due to the pressure relief device, gas inside a pump body can be exhausted when the pressure pump stops working, it is ensured that no load is formed when the pressure pump is started again, and use is safe and reliable. The invention further relates to a positive pressure sampling pump station for the sampling system. The positive pressure sampling pump comprises at least two sets of the positive sampling systems, and multi-way sampling gas conveying is achieved.