A ventilation therapy apparatus, comprising: a main body , a respiratory pipe , a patient interface , an oxygen supply module , an oxygen proportional valve and a control module ; wherein, the main body is configured for outputting gas with a preset pressure and a preset flow, and the main body comprises an output end; the respiratory pipe comprises a first end and a second end which communicates with each other, and the first end of the respiratory pipe communicates with the output end; the second end of the respiratory pipe is connected to the patient interface , the patient interface is configured for being worn on a patient's nasal cavity, and when the patient interface is worn on the patient's nasal cavity, an air outlet gap is disposed between the patient interface and the patient's nasal cavity; the oxygen supply module is connected to the main body through the oxygen proportional valve , and a fan is disposed in the main body ; the main body is configured to mix an inhaled air with the oxygen provided by the oxygen supply module , and output a gas mixture through the respiratory pipe ; the control module is connected to the main body and the oxygen proportional valve , respectively; and the control module is configured for detecting output parameters of the main body , the output parameters comprising an airflow pressure and an air flow at the output end of the main body , when it is determined that the main body is in a preset state, the control module , according to the output parameters, is configured to: control the oxygen proportional valve to open at a corresponding preset opening degree, and control the fan of the main body to run at a corresponding preset rotating speed. the main body is configured for outputting gas with a preset pressure and a preset flow, and the main body comprises an output end; the respiratory pipe comprises a first end and a second end which communicates with each other, and the first end of the respiratory pipe communicates with the output end; the second end of the respiratory pipe is connected to the patient interface , the patient interface is configured for being worn on a patient's nasal cavity, and when the patient interface is worn on the patient's nasal cavity, an air outlet gap is disposed between the patient interface and the patient's nasal cavity; the oxygen supply module is connected to the main body through the oxygen proportional valve , and a fan is disposed in the main body ; the main body is configured to mix an inhaled air with the oxygen provided by the oxygen supply module , and output a gas mixture through the respiratory pipe ; the control module is connected to the main body and the oxygen proportional valve , respectively; and the control module is configured for detecting output parameters of the main body , the output parameters comprising an airflow pressure and an air flow at the output end of the main body , when it is determined that the main body is in a preset state, the control module , according to the output parameters, is configured to: control the oxygen proportional valve to open at a corresponding preset opening degree, and control the fan of the main body to run at a corresponding preset rotating speed. control the oxygen proportional valve to open at a corresponding preset opening degree, and control the fan of the main body to run at a corresponding preset rotating speed. <EOS>