The invention discloses a device for keeping a patient respiratory tract unobstructed and monitoring regurgitation of gastric content. The device comprises a base, wherein adjusting brackets which can slide along the base are respectively arranged on the left side and the right side of the base; lower jaw supports are respectively arranged on the opposite inner sides of the two adjusting brackets; each adjusting bracket is provided with a lower jaw support mounting block, a driving part for driving the lower jaw support mounting block to lift, and a lower jaw support lifting guide part; one of the adjusting brackets is further provided with a warning mechanism for monitoring regurgitation of gastric content; the warning mechanism comprises a monitoring probe and a monitoring system; the monitoring probe is connected with the monitoring system through a conductive wire; the monitoring probe is internally provided with a pH sensor and a temperature sensor. The device for keeping the patient respiratory tract unobstructed and monitoring regurgitation of gastric content can lift up the lower jaw of the patient to push forward the lower jaw joint, fixes the lower jaw according to the clinical demand, and keeps breath smooth; the warning mechanism can detect the pH value in the oral cavity and the body temperature change of the patient, and avoids the accident of death from suffocation because the situation about regurgitation of gastric content of the patient is not found in the surgery process.