Nut protective sleeve

The utility model relates to the technical field of bolt protection construction, in particular to a nut protection sleeve which comprises a semispherical protection sleeve matched with a nut, a pull ring is arranged on the semispherical protection sleeve, and a magnetic adsorption ring is arranged on the lower edge of the semispherical protection sleeve. The device can be firmly adsorbed on the surface of a template through the magnetic adsorption ring, and the semispherical sheath can provide effective protection for threads and nuts exposed in an external severe environment; under the condition that mechanical equipment is subjected to a variable load (such as a vibration effect) or an accidental load (an impact effect), falling is not prone to occurring, and mounting and dismounting are convenient; by means of the protective sleeve, dirt on the surface of the bolt can be removed when the bolt is detached and replaced, the service life of the bolt is prolonged, and the maintenance cost is reduced. 本实用新型涉及螺