The invention relates to the field of construction tools, in particular to a portable safety fence for electric power construction. The portable safety fence for the electric power construction comprises a plurality of inflated isolation belts and a plurality of tapered bag barrels, the two ends of each inflated isolation belt are separately connected with one of the tapered bag barrels, the inflated isolation belts are of square structures and are connected with the tapered bag barrels in series, and each tapered bag barrel comprises a ground positioning device and a warning device. Accordingto the portable safety fence for electric power construction, the tapered bag barrels are placed on the periphery of a position to be constructed in a square state and are connected in series throughthe inflated isolation belts; when the safety fence is required to be used, the ground positioning devices are fixedly arranged on the ground, then the warning devices are mounted on the ground positioning devices, the warning devices can play the effect of warning passers-by, and the ground positioning devices play the action of fixing and preventing dumping; and finally, the inflated isolationbelts are connected to the tapered bag barrels, a square or a circular protective areas is formed, carrying is facilitated and mounting is convenient.