The utility model discloses a portable foot-rest device comprising a connecting band and two pedals. The pedals are respectively suspended at two ends of the connecting band and are formed integrally; and a stabilizing bar is connected between the pedals, and is detachably connected between the pedals. When V-shaped insulators or ultrahigh voltage tension insulators are replaced in power failure or charged work high above the ground, an operator can place the portable foot-rest device on a V-shaped single string of insulators or the same with large horizontal spaces with two feet resting on the pedals, so that the operator can maintain body balance on the insulators, and can operate tools easily without using great effort; and replacement efficiency of the V-shaped insulators is greatly improved, and higher safety is guaranteed.