The utility model discloses an anti-theft thermos bottle which comprises a bottle body and a bottle cap. The bottle cap is provided with a buckling piece which is locked with the bottle body. The bottle cap and the bottle body are provided with spring bolts provided with locking holes, and the lock cap and the lock bottle can be locked through a lockset. Or, a bayonet lock is arranged on the inner side of the bottle cap, a lock cylinder and a rotating latch are arranged at positions, close to a bottle opening, of the interior of the bottle body, and the rotating latch is buckled with the bayonet lock or is separated from the bayonet to be controlled by the lock cylinder. The anti-theft thermos bottle is simple in structure. Under the condition that the lockset is not unlocked, the bottle cap cannot be opened, the thermos bottle cannot be used normally, and therefore, the bad behavior that some people steal thermos bottles of other people is eradicated.