The invention relates to an insufflator with a pressure stabilizing function. The insufflator comprises a pressure reducing module, a proportional valve, a control unit, an exhaust valve, a switchingvalve, a first pressure sensor and a second pressure sensor and further comprises a flow monitoring unit. The proportional valve, the switching valve and the exhaust valve are respectively connected to corresponding ports of the flow monitoring unit, and the flow monitoring unit is electrically connected to the control unit. The flow monitoring unit is adopted to monitor the actual pressure of thehuman abdominal cavity, then the actual pressure is sent to the control unit for processing, and the control unit controls opening and closing of the proportional valve or the exhaust valve accordingto comparison of the set abdominal pressure and the actual pressure of the abdominal cavity to achieve air injecting or exhausting correspondingly. A pressure stabilizing control method replaces thetechnical scheme in the prior art that a single pressure sensor is utilized to judge the air pressure of the surgical space, and overcomes the shortcoming in the prior art of the delay-time effect caused by the sensor and the proportional valve. The pressure error is small, the pressure control stability is good, and the method is favorable for the surgery made by a doctor.