Medical first-aid ventilator equipment. It is an electrically controlled pneumatic ventilator integrating such functions as time, volume cycling, pressure limit, etc., it provides an alternation in case of irreversible lesions in respiratory muscles or irreversible damage to upper airway to maintain the respiratory function of the patient, and also provides ventilation assistance for the patient during the recovery from a disease or operation. Specifications: 1. Gas drive and electrical control, time-pressure switching and pressure limit control. 2. A high-brightness digital display is used to present the control frequency, tidal volume, throughput, overall respiratory rate, spontaneous breathing frequency, etc. 3. A highly sensitive and responsive pressure sensor and a flow sensor are used to measure, control and display the airway pressure and gas flow rate and the ventilator is equipped with automatic throughput compensation. 4. In case of an abnormality to the ventilator or misoperation, the ventilator can raise a visual-audible alarm to automatically protect itself.