The utility model provides an electric coupling mechanism for production facility under water, is equipped with: one is used for the wiring base plate be electrically connected with the pipeline, is equipped with the bolt hole on the base plate of should working a telephone switchboard, through bolt and nut to being connected with the toothed washer and the one end of the copper conductor that has the wire connection piece in the bolt hole, the wire connection piece of the other end of copper conductor utilizes bolt and nut to fix on main part steel construction, pipeline support screwing up with the toothed washer, makes and forms good being electrically connected between pipeline and the copper conductor. The utility model discloses simple structure not only can make can both reach good being electrically connected between each mechanical contact part of production facility under water, and the solve is the cathodic protection system integrality problem of production facility under water, but also, can put position adjustment to being electrically connected according to sacrificial anode's the position of arranging, simultaneously, can absorb the relative displacement and the thermal expansion displacement of pipeline and main structure, avoid because the relative displacement of pipeline and main structure breaks the wire.