The invention relates to a method for setting the position stroke of an electric actuating mechanism. The method comprises the following steps that 1, the electric actuating mechanism is made to run to a full-off position, and the current position is set as the full-off position S1; 2, access to a user parameter set interface is achieved, the number of full-stroke turns Q0 is input into system parameters, and the parameter Q0 is determined by a user; and 3, a full-on position S2 needing to be set is obtained by a system of the electric actuating mechanism in a conversion manner according to the number of turns input by the user, automatic setting is carried out, S2=Q0*I+S1, and I is the specific value of the rotating speed of an inner stroke collection device and the rotating speed of an output shaft and is a local intrinsic parameter. According to the novel method for setting the position stroke of the electric actuating mechanism, the full-on position and the full-off position are set through the method of setting the number of turns, and the time that the user must move the electric actuating mechanism from the full-off position to the full-on position is saved. The full-off position is adopted as the base, the data of the full-on position are obtained through calculation, convenience and quickness are achieved, and the operation and use efficiency is improved.