Instrument drainage device suitable for TRT gas pipeline

The utility model relates to an instrument drainage device suitable for a TRT gas pipeline, which comprises a vertical pipeline and a horizontal pipeline, the lower end of the vertical pipeline is connected with one end of the horizontal pipeline through an arc-shaped pipeline, the upper end of the vertical pipeline is connected to a point taking position at the upper part of the gas pipeline, and the other end of the horizontal pipeline is connected to an instrument probe; a connecting hole is formed in the bottom of the joint of the horizontal pipeline and the arc-shaped pipeline, a flow guide pipe is downwards connected to the connecting hole, a shutoff valve a and a shutoff valve b are arranged on the upper portion and the lower portion of the flow guide pipe respectively, a water tank is connected to a lower port of the flow guide pipe, and a drainage valve is arranged on the side of the water tank. An automatic alarm device is also arranged in the flow guide pipe; according to the device, water in the i