The invention provides a negative pressure drainage monitoring device and system capable of performing real-time accurate monitoring on the flow rate of drainage fluid in a negative pressure drainageprocess. The negative pressure drainage monitoring device comprises a drainage tube, an information acquisition module, an electromagnetic valve, a control module and a display module, wherein the drainage tube is used for performing drainage on the drainage fluid in the human body; the information acquisition module is arranged on the drainage tube; the electromagnetic valve is arranged on the drainage tube in the drainage direction of the drainage fluid, and is located at a position behind the information acquisition module; the control module is connected with the information acquisition module and the electromagnetic valve; and the display module is used for displaying acquired circulation parameters in a real-time manner. According to the negative pressure drainage monitoring device disclosed by the invention, the information acquisition module is used for acquiring the circulation parameters of the drainage fluid in a real-time manner, and the control module is used for controlling the electromagnetic valve to adjust the size of an opening according to a predetermined parameter threshold and the acquired circulation parameters, so that the flow rate of the drainage fluid is in an appropriate range, real-time accurate control of the whole drainage process is realized, medical personnel or family members and the like can conveniently and visually know the drainage situation, and the safety of the drainage process is greatly improved.