Bolt protective cover and using method thereof

The invention provides a bolt protective cover and a using method thereof, and belongs to the technical field of ship protection equipment. The bolt protective cover is made of elastic materials in an integrated mode, has certain elasticity, can enter a small space to be installed on a nut and a bolt, and is convenient to install. In the bolt protective cover, the nut protective cylinder with the hexagonal cross section of the inner hole can be in nearly gapless contact with the nut, and the nut is protected. The closed end of the bolt protection barrel and the bolt protection barrel can well protect the bolt in the nut hole in the ship. The locking belt with one end connected with the peripheral wall of the nut protection barrel in the bolt protection cover is wound on the nut protection barrel to be knotted, the locking teeth of the locking belt face the nut protection barrel, the nut protection barrel with certain elasticity can be locked on a nut of a ship, the whole bolt protection cover is convenient to