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.