The invention discloses a device for preventing personnel in a car from choking and a method. The device comprises a controller electrically connected with a vehicle power supply, wherein the controller is electrically connected with a gathering module, an execution module, a communication module and a warning module. The gathering module comprises a rotating speed sensor, a speed sensor, an oxygen sensor, a carbon monoxide sensor and a nitric oxide sensor, wherein the rotating speed sensor is used for inspecting the rotating speed of an engine, the speed sensor is used for inspecting the vehicle speed, oxygen sensor is used for inspecting oxygen concentration in a driving cab, the carbon monoxide sensor is used for inspecting the carbon monoxide concentration in the driving cab, and the nitric oxide sensor is used for inspecting the nitric oxide concentration in the driving cab. The execution module comprises a window opening unit used for opening car windows and an unlocking unit used for unlocking a car lock. The communication module comprises a GSM unit used for remote communication and a Bluetooth unit used for short range communication. The warning module is electrically connected with car warning lights, car horns and in-car stereos correspondingly. Based on the device, the occurrence of choking situation of personnel in the car can be effectively avoided, and car usingsafety can be guaranteed.