The invention relate to the field of welding of steel rails, and discloses a method for movable flash welding of a 75 kg/m hypereutectoid steel rail and a pearlite steel rail, and the steel rails obtained through welding according to the method. The method comprises the steps of flash flattening, pulsing, accelerated burning, upsetting and pressure maintaining, and is characterized in that the total heat input for welding in the movable flash welding process is controlled to 10-13 MJ, the total duration for welding is 143-162 s, and the upsetting amount for welding is 15.5-18.5 mm. By adoption of the method, movable flash welding of the 75 kg/m hypereutectoid steel rail and the pearlite steel rail can be achieved, internal defects of joints of dissimilar steel rails are few, and the welding quality is stable; and the joints of the dissimilar steel rails can be checked continuously through 15 splash welding joint drop hammers, and the stability is good.