This quick-operating thread protector is a manually installed tool specially designed to shield casing external threads during transportation, storage and rig handling. Its simplified mechanical structure enables fast assembly and removal without extra auxiliary tools. Made of high-strength wear-resistant material, it features solid construction and long service life. It effectively prevents thread damage from collision, scratches, mud corrosion and water erosion, guarantees thread precision and sealing performance of casing, and delivers stable, reliable protection for long-term field use.