The utility model provides an electric fly line interface structure under water, includes: operating panel, installing at the baffle of operating panel both sides, installing the several bracing piecein the operating panel bottom, wherein, operating panel is last to be equipped with that the fly line that is connected with electric fly line under water connects, the hole is put temporarily to electric fly line, electric fly line joint mounting hole and sign, it constructs to install fixed knot on the fly line connects, the last spacing guide structure of electric fly line that installs of operating panel. The utility model discloses not only can restrict electric fly line and remove in regional reasonable safe, solve that electric fly line takes place to twine at the in -process of installation, production, maintenance, the scheduling problem slides, and, can also adapt to the protection device's of facility components of a whole that can function independently under water back installation, improved the stability of fly line panel greatly, strengthen the fly line panel and put the reliability in the use into production.