The invention relates to an automatic driving behavior optimizing method which can judge bad driving behaviors. The bad driving behaviors comprise at least one of high-speed driving at a low gear, abrupt acceleration and unsteady stepping on an accelerator, and corresponding control algorithms are adopted to relieve the bad driving behaviors: when the driving behavior of high-speed driving at a low gear occurs, the highest rotation speed of an engine of a vehicle is limited to be at a preset highest rotation speed value; when the behavior of abrupt acceleration occurs, an actual accelerator pedal value is limited, and an output accelerator pedal value is acquired and does not exceed the actual accelerator pedal value under a normal driving condition; when the behavior of unsteady stepping on the accelerator occurs, the engine is controlled to output a power value according to an engine torque value corresponding to a set accelerator pedal value. According to the method, power output of the engine is directly controlled, active correction and optimization are performed when a driver has a bad driving behavior, the bad driving problem is fundamentally solved, and the driving safety and the fuel conservation effect are improved.