Abstract: A frequency regulator protection circuit for controlling acceleration of electric vehicle comprises a power unit, a display unit, a protection unit, a control unit, a sensor unit, a data processor unit, a trigger unit, a regulator unit, and an output unit. The control unit receives a rotation speed signal from a motor. The sensor unit detects whether there is a current overload and delivers a corresponding overload signal to the data processor unit that consequently outputs a frequency change signal to the trigger unit which, in turn, delivers a first regulation signal to the regulator unit. The output unit further delivers a second regulation signal to the regulator unit, corresponding to different situations of insufficiency of pedal control, brake control, over-speed control, or motor overload. The regulator unit consequently effectuates an adequate cutoff of power supply.