The utility model relates to an electromagnetic type marine fender ball, and belongs to the field of ship deck outfitting equipment. According to the fender ball device, electromagnets are arranged on two sides of a rubber fender ball, and electromagnet coils of all electromagnets are connected in parallel and electrically connected with a waterproof power socket through cables. The fender ball device is used for fast berthing of two ships in an anchoring state or in a navigational state, can prevent the two ships from rigid collision and can prevent the two ships from being separated; different from a traditional berthing manner, the device is not limited by molded depth and draught of the ships and is applicable to water berthing of different types and different sizes of ships in various loading states. The device is placed on a deck at ordinary times and can be used alone, or more than two fender ball devices are arranged in the ship length direction and matched for use; and during working, the fender ball device is placed into the water through a bracket and a steel wire rope from the shipboard, and the electromagnetic fender ball generates magnetic force after powered on, so that one side, close to one ship, of the electromagnetic fender ball is absorbed on the ship side plate, the other side of the electromagnetic fender ball is absorbed on the shipboard of a mooring ship when the ship is close to a to-be-berthed ship, and accordingly, the berthing of the two ships is finished. The electromagnetic type marine fender ball can be used for safe and fast berthing of ships such as a supply ship, a medical ship, an LNG (liquefied natural gas) refueling ship and the like to other ships or large ocean structures such as an ocean platform and the like.