The invention discloses a gastrointestinal fluid decompression device for the gastrointestinal surgery, and particularly relates to the field of medical devices. The gastrointestinal fluid decompression device comprises a collection box, a top panel is arranged on the top of the collection box, the two sides on the bottom of the top panel are fixedly connected with the collection box through a supporting rack, and a decompression mechanism is arranged between the top panel and the collection box. The portion, corresponding to the upper surface of the collection box, of the outer side of the supporting rack is fixedly connected with a deodorizing box, a stirring mechanism is fixedly arranged on the bottom of an inner cavity of the collection box, and a telescoping baffle assembly is fixedlyarranged at the edge of the top of the inner cavity of the collection box. Through up-down stretching and shrinking of a compression air bag, negative pressure is generated, drainage of gastric juicecan be achieved, air flow generated by compression is used as power of the stirring mechanism, smashing of the gastric juice is facilitated, discharging is facilitated, and gas and smashed liquid which are discharged from the stomach can be discharged. The whole device is simple in structure, only one electric cylinder is needed, running of the device can be achieved, the cost is low, and electric energy is saved.