An electromagnetic marine fender and a using method thereof belong to the field of ship deck outfitting equipment. The electromagnetic marine fender is characterized in that electromagnets are arranged on two sides of a runner fender; and the electromagnet coils of the electromagnets are connected in parallel and then are electrically connected with a waterproof power socket through cables. The electromagnetic marine fender is used for the quick berthing of two ships in an anchored state or a sailing state, prevents rigid collision between the two ships and limits the separation of the two ships; and different from the traditional mooring mode, the electromagnetic marine fender is free from limitations of the moulded depths and draughts of the ships, and is applicable to on-water berthing of ships of different types and different dimensions under various conditions of loading. The electromagnetic marine fender is placed on a deck in normal times and can be used independently, and more than two such electromagnetic marine fenders can be arranged in the length direction of a ship to be used in combination. When in use, the electromagnetic marine fender is placed into water through a support and a wire rope from a boardside, and generates a magnetic force after being electrified so as to enable the side close to a ship to be attached to a side plate of the ship; when the ship and a ship to be berthed get close, the other side of the electromagnetic marine fender is attached to the broadside of the moored ship to complete the berthing of the two ships. The electromagnetic marine fender can be used for safe and quick berthing of a supply ship, a medical ship, an LNG (Liquefied Natural Gas) filling ship and other ships, or an ocean platform and other large-scale ocean structures.