The invention discloses a submergible dynamic positioning marine nuclear power station which comprises a double-layer shell ship. A reactor room, a protection shell, a reactor device, a generator room, a generator unit, an electric propulsion device room and an electric propeller are arranged on the double-layer shell ship, and the electric propeller drives a main propulsion device in a propeller and rubber room. A loading water room is formed between shells of the double-layer shell ship. The submergible dynamic positioning marine nuclear power station can be arranged in a shallow sea area and a deep sea and near an island, and is especially suitable for a deep sea area with severe sea conditions, and energy is provided for marine oil and gas development, island development and the like through nuclear energy. Due to the fact that a power mode is utilized for positioning and extreme weather conditions can be avoided through a submergible mode, the adaptability is high in the deep sea area, different unit plant number configuration can be adopted according to energy needs, and the submergible dynamic positioning marine nuclear power station has the important promotion function on marine resource development. The floating power station can be used for supplying energy to military bases or dual-use large comprehensive supply bases, and has good military application prospects.