Safe driving method and device and car

The embodiment of the invention provides a safe driving method and device and a car. The safe driving method comprises the steps that first temperature of a friction plate of a car brake is acquired; the first speed of the car is acquired; according to the first temperature and the first speed, the output torque and gear of a car transmission and the throttle percentage of an engine are adjusted. According to the embodiment, when the temperature of the car brake is too high, the speed of the car and the temperature of the car brake can be reduced, and the situation that the braking efficiency of the car brake is reduced, and consequently danger occurs is avoided.