The present invention discloses a negative pressure respirator comprising a blower and a blowerThe controller, a valve, a chest clamp, a stepping motor controller, a control module, a power supply module, a display device and an input device. The new model uses a pressure detector to feedback the pressure value, and controls the stepping motor controller through the control module to adjust the switching valve speed, thereby achieving accurate and effective control of the breathing rhythm and airway pressure, and solving the troubles in the prior art. .本新型揭露一種負壓呼吸器，該負壓呼吸器包含一鼓風機、一鼓風機控制器、一閥門、一胸夾、一步進馬達控制器、一控制模組、一電力供應模組、一顯示裝置及一輸入裝置。本新型具利用壓力偵測儀回授壓力值，並透過控制模組控制步進馬達控制器以調整開關閥門速度，藉以達到精準有效的控制呼吸節奏及氣道壓力，解決習知技術中的困擾問題。
