The utility model discloses a special lightning protection device of double -phase power of offshore oil production platform belongs to offshore oil production platform electrical power generating system lightning protection device technical field. Its technical scheme does: including the lightning protection module, still including setting up the outer metal casing of lightning protection module, lightning protection module parallel arrangement is two, two generating lines of both sides parallel arrangement of two lightning protection modules, the generating line is rather than one side the lightning protection module is parallelly connected, the generating line with the input of lightning protection module passes through the wire and connects. The beneficial effects of the utility model are that: the generating line separately arranges in the upper and lower both sides of lightning protection module, the very big inner space that reduces, and the generating line is shorter with lightning protection module connection distance, and the residual voltage can be lower when releasing the lightning current, and the protection effect is better, ground lead length is equivalent to zero, and when releasing the lightning current, the residual voltage that ground lead arouses is equivalent to zero, adopt the plug -in type connected mode during installation wiring, install and change rapid mode, very big save time.