Gastrointestinal fluid pressure reducer

The utility model discloses a gastrointestinal fluid pressure reducer which comprises a drainage tube, one end of the drainage tube is connected with an adapter, the adapter is used for being connected with a stomach tube, the other end of the drainage tube is connected with a collecting device, the collecting device is used for collecting led-out liquid and gas, and the adapter comprises an adapter body and a gasket. One end of the adapter body is in threaded connection with a drainage tube body, screws distributed in an array mode are arranged at the other end of the adapter body, the adapter fixes the gasket to the adapter body through the screws, a connecting piece used for being connected with a stomach tube is arranged in the adapter body, a filter screen is arranged in the adapter body, and the filter screen is located below the connecting piece. The filter screen is used for intercepting solids in intestines and stomach to avoid precipitation caused by drainage liquid, so that a doctor can make a diag