The invention is concerned with an auto-control method for preventing from urgent braking and pressing accelerator pedal mistakenly belonging to auto-control technology field. The testable electromagnetism valve sets on the upriver side of throttle for step and sends the pressure different of fuel to the upper and lower steam of the valve to the pressure intake port of pressure different sensor. The pressure different of flow changes into electric signal of flow pressure different by the sense organ in the sensor and sends to the intake end of signal processor. Set criterion of urgent braking and pressing accelerator pedal mistakenly as the determinant threshold value according to vehicle's type in the signal processor, and the signal processor will judge and estimate according to the instantaneous flow to fuel. When it judges the mistake of braking, it will send braking order to controller to close the testable electromagnetism valve and cut off the fuel through electronic switch, at the same time, the electric pushing pole drives the car to stop to avoid traffic accident.