The invention discloses a critically ill patient postoperative combined monitoring nursing device, and relates to the technical field of medical equipment, the critically ill patient postoperative combined monitoring nursing device comprises a supporting base, a reinforcing plate is arranged above the supporting base, a rotating motor is in threaded connection with the middle of the bottom surface of the reinforcing plate, a rotating disc is in key connection with the working end of the rotating motor, and a disc is installed at the bottom of the rotating disc through threads; liquid storage tanks are fixed in the mounting discs in an array mode, the tops of the liquid storage tanks abut against the bottom of the rotating disc, connecting holes penetrate through the bottoms of the mounting discs in an array mode, a limiting plate is arranged below the reinforcing plate, mounting holes penetrate through the top face of the limiting plate, infusion needles are arranged in the mounting holes and embedded in the mounting holes, and electromagnets are in threaded connection with the bottoms of the infusion needles. By adopting the rotating disc, the liquid storage tank, the electromagnet and the infrared liquid measuring device, a patient can automatically replace an infusion medicine bottle without being cared by medical staff after an operation, the time for replacement is automatically judged, the working pressure of the medical staff is reduced, and the safety of the patient after the operation is effectively guaranteed.