The invention discloses an accelerator pedal opening degree analysis control method, device and system. The method includes the steps that an accelerator pedal, a brake pedal and the gear state of anautomobile are detected, and the initial accelerator pedal opening degree is obtained; whether a driver steps on both the accelerator pedal and the brake pedal or not and whether the gear is a drive gear or not are judged, and if the driver steps on both the accelerator pedal and the brake pedal and the gear is the drive gear, the current vehicle speed is obtained; if the current vehicle speed ishigher than a preset vehicle speed threshold value and the initial accelerator pedal opening degree is larger than a first preset value, the initial accelerator pedal opening degree is controlled to be reduced to the first preset value according to the preset gradient change rate; if the current vehicle speed is lower than the preset vehicle speed threshold value and the initial accelerator pedalopening degree is larger than a second preset value, the accelerator pedal opening degree is adjusted with the zero vehicle speed as a control target until the vehicle speed is reduced to zero; and the initial accelerator pedal opening degree is kept under other conditions. When the driver steps on the accelerator pedal and the brake pedal at the same time, different strategies are adopted according to different states of a vehicle to conduct brake control, safety is high, and user experience is good.