The invention discloses a silent ventilator, which comprises a base, the top of the base is provided with a double-layer sound insulation layer, and the inner bottom end of the double-layer sound insulation layer is sequentially provided with a negative pressure pump, a micro air pump and an air storage tank, The top of the micro air pump is provided with a trachea, the end of the trachea is connected with a double-layer sound insulation layer, the top of the negative pressure pump is connected with a flow detector through a pipeline, and one side of the negative pressure pump is provided with an exhaust pipe, The present invention is equipped with a solenoid valve, an auxiliary three-way tube and a sputum suction tube. The NUC controller controls the solenoid valve to close, and the negative pressure pump sucks the sputum in the patient's body into the auxiliary three-way tube through the sputum suction tube, and the negative pressure pump The exhaust pipe on one side is discharged, which is convenient to discharge the sputum in the patient's body through different pipes, so as to prevent the infection of the patient, and avoid the sputum suction pipe and the breathing pipe of the ventilator passing through the same pipe when using the ventilator, which may easily cause infection of the patient and affect the The issue of the safety of the use of ventilators.