Automatic control system capable of effectively preventing mistaken stepping on accelerator

The invention discloses an automatic control system which is capable of preventing a driver from mistakenly stepping on an accelerator to cause a traffic accident. The automatic control system capable of effectively preventing mistaken stepping on an accelerator comprises a distance measurement module, a speed sensor, an acceleration sensor, a microprocessor and an audible and visual alarm, wherein the distance measurement module is used for measuring distance S between a self car and a front car or an obstacle, and the microprocessor calculates the current critical safe braking distance S0 according to information obtained by the speed sensor and a road sensor, assigns a safety factor a and marks a safe braking distance S1. When S is bigger than S0 and smaller than S1, the alarm sounds an alarm to remind the driver to take some measures. When S is smaller than S0, if the driver steps on the accelerator, an electronic control unit (ECU) comprehensively processes information acquired by the acceleration sensor and other system information, whether the driver mistakenly steps on the accelerator is judged, if the driver mistakenly steps on the accelerator, an instruction is output to adjust the opening degree of an air valve and cut off an oil supply system to enable the air valve to lose efficacy, and the fact that the car speeds up to move forward due to the fact the driver mistakenly steps on the accelerator in panic is avoided.