Instant alarm door lock for hotel

The invention relates to the technical field of door locks, and discloses a hotel instant alarm door lock which comprises a lock body and a sliding cover, the sliding cover slides at the top end of one side of the lock body and is vertically arranged, a turning cover is hinged to the bottom of the sliding cover, sliding grooves are vertically formed in the symmetrical side faces of the sliding cover, and second friction blocks are arranged in the two sliding grooves in a sliding mode. Two second friction blocks are arranged on the lock body, movable rods are rotationally installed on the two sides, away from each other, of the two second friction blocks, a folding rod is fixedly installed on the top of each second friction block, the other two ends of each folding rod penetrate out of the corresponding sliding groove, the two folding rods are symmetrically arranged, and belts are vertically and rotationally arranged on the symmetrical side faces of the lock body. Through the arrangement of the sliding cover,