The invention discloses a non-spiral-demounting oil pipe end thread protector which comprises two semispherical barrels and a locking mechanism. The inner surface of each semispherical barrel is provided with an internal thread matched with a thread at the end of a protected oil pipe, the semispherical barrels are buckled at the thread at the end of the protected oil pipe, and the locking mechanism locks the semispherical barrels after being buckled. By the non-spiral-demounting oil pipe end thread protector, when being hoisted from a ramp plate to a drill floor and when a drift diameter gauge is taken out and an upright demounting protection wire is connected, a thread end of the oil pipe does not need to be completely brought in or taken out spirally, and the thread protector can be demounted by only slightly separating, so that the thread protector can be demounted quite conveniently, operating efficiency is improved greatly, and labor intensity and construction risk of operating personnel are lowered.