The invention relates to a vapor generator sludge washing nozzle device for an ERP (European pressurized reactor) type nuclear power plant. The vapor generator sludge washing nozzle device comprises a spraying gun connecting rod and three nozzles, a rotatable transmission shaft is coaxially arranged on the spraying gun connecting rod, the nozzles are alternately and detachably mounted on the end portion of the spraying gun connecting rod, the front ends of the nozzles can be driven by the transmission shaft to rotate circumferentially within an A-A section, and included angles of the nozzle front-end axes of the nozzles and the axes of rotating shafts are 60 degrees, 0 degree and -60 degrees respectively. The vapor generator sludge washing nozzle device is provided with the three nozzles at different angles, and water can be sprayed from different angles to clean a vapor generator, so that cleaning effect of the vapor generator is improved; the front ends of the nozzles can be driven by the transmission shaft to rotate by 180 degrees so as to clean whole vapor generator heat conducting pipes, so that working efficiency is improved.