The invention provides a residence fresh-air positive pressure guarantee system based on internet of things. The residence fresh-air positive pressure guarantee system comprises a fresh-air ventilator control unit, an air supplement device control unit, a kitchen ventilator state detecting unit and an exhaust fan state detecting unit; the kitchen ventilator state detecting unit is used for detecting tap position state signals of a kitchen ventilator and sending the tap position state signals of the kitchen ventilator to the fresh-air ventilator control unit and the air supplement device control unit; the exhaust fan state detecting unit is used for detecting tap position state signals of an exhaust fan and sending the tap position state signals of the exhaust fan to the fresh-air ventilator control unit and the air supplement device control unit; the air supplement device control unit is used for outputting suitable air supplement quantity according to the tap position state signals of the kitchen ventilator and / or the tap position state signals of the exhaust fan; and the fresh-air ventilator control unit receives the tap position state signals of the kitchen ventilator and / or the tap position state signals of the exhaust fan, and controls an air feeder to output certain air quantity to maintain the indoor positive pressure state, and therefore indoor air quality is ensured.