The invention provides a live working water operating platform for the electric transmission line of a river network region. The live working water operating platform comprises a floating platform andan operating platform, wherein the operating platform is installed on the floating platform; the floating platform comprises three first buoys which are distributed as an equilateral triangle; the upper end of the center of the three first buoys is provided with a second buoy; the three first buoys and the second buoy are connected through connecting pipes; and the bottom ends of the three firstbuoys are independently provided with a water pressure plate. By use of the cooperation of the floating platform and the operating platform, a temporary workbench can be built, the stability and the firmness of the floating platform are high, and the safety of operation personnel is guaranteed.