The invention discloses a maximum speed limitation method and device used for electric cars. Firstly, the driving torque of a motor is limited under a first threshold; then, whether or not the acceleration of an electric car is larger than a third threshold and the speed of the electric car is larger than a forth threshold are determined in real time; if the acceleration is no more than the third threshold and the speed is no more than the fourth threshold, the driving torque of the motor is controlled unchanged; if the acceleration is larger than the third threshold or the speed is larger than the fourth threshold, the driving torque of the motor is reduced; the driving torque of the motor is adjusted in real time according to the speed and the acceleration of the electric car. By means of the method and device of the invention, the maximum speed of an electric car is limited so as to prevent overspeed of electric cars and prevent personal and property loss.