The invention relates to a transmission mechanism of an integral type pull-rope type electronic parking brake, comprising a motor. The motor is arranged on a motor installing cover which carries out matching and positioning with an installing shell of a speed reducing mechanism by via an inner ring surface of the motor installing cover; the motor is connected with a motor gear shaft which is matched with two speed reducing gears by a gear; the two speed reducing gears are connected by a spline and are fixed with two speed reducing gear shafts; the two speed reducing gear shafts are matched with four speed reducing gears which are connected by splines and are fixed with a screw shaft; the right end of the screw shaft is connected with a special nut by saw-toothed inner threads; the right end of the special nut is connected with a pull rope head connector by threads; and the outer assembling surface of the special nut is matched with an inner hole of the pull rope limiting mechanism by clearance fit. In the transmission mechanism, the motor is used for replacing mechanical operation, faster and more convenient parking braking is provided, and automatic control is easily realized.