The utility model provides an electric power construction special use sheath of acting as go -between, the main part is the sheath of acting as go -between, is fixed to set up by the tubule to constitute at extra heavy pipe top end, and the inside cavity of tubule and extra heavy pipe switches on each other, and tubule top end is provided with waterproof stopper, and waterproof stopper is round platform shape rubber buffer, is provided with a plurality of way sluicing grooves to the side of the waterproof stopper, and sluicing groove width degree diminishes bottom waterproof stopper top to waterproof stopper gradually, and the interval equals between the adjacent sluicing groove. Its simple structure is provided with waterproof stopper at tubule top end, the act as go -between waterproof performance of sheath of effectual improvement, the corrosion that slows down the inside power equipment of sheath that acts as go -between, extension equipment life. The extra heavy pipe surface is provided with ventilative mouthful of a plurality of, has increased the ventilation effect of the sheath of acting as go -between, effectively prevent owing to inside long -time airtight inside gaseous the stopping up of leading to the fact of sheath of acting as go -between, and the oxidation reaction on aggravation equipment surface, and then influence the mechanical strength that power equipment acted as go -between.