The utility model discloses a prevent control system that stifles in high suitability car, this system electric connection in on -vehicle storage battery and air -conditioner fan, including sensory package, apparatus of oxygen supply and central controller, the sensory package includes oxygen sensor and carbon monoxide transducer, sets up respectively in the carriage, oxygen sensor and carbon monoxide transducer are connected with central controller to transmit sensor signal for central controller, the apparatus of oxygen supply is including setting up the oxygen jar in the carriage, be equipped with electric valve on the gas outlet of oxygen jar, electric valve is connected with central controller to by its switch of central controller control, central controller provides the power by on -vehicle storage battery, and while and air -conditioner fan are connected to control air -conditioner fan opens and stops. The simple structure of this system, on -vehicle simple to operate, dependable performance, the strong and low price of circumstances suitability of suffocating respectively.