The invention relates to a mechanical anti-reverse-rotation device for escalators. The mechanical anti-reverse-rotation device can effectively realize anti-reverse-rotation of the escalators and thus ensure the use safety of the escalators. The mechanical anti-reverse-rotation device for escalators has a following structure: guide rails comprise a first guide rail and a second guide rail; sliding blocks comprise a first sliding block and a second sliding block; pawls comprise a first pawl and a second pawl; ratchet wheels comprise a first ratchet wheel and a second ratchet wheel, the first ratchet wheel and the second ratchet wheel, of which the ratchet teeth are reversely arranged, are arranged on a rotating shaft of the escalator in parallel at a distance and rotate along with the rotating shaft, a bottom plate is fixedly arranged on a fixed support of the escalator, a sliding plate which slides left and right is arranged on the bottom plate, and a movable handle, a first spring supporting plate, a first guide rail, a first pawl locating plate, a second pawl locating plate, a second guide rail and a second spring supporting plate are sequentially arranged on the sliding plate from left to right. The mechanical anti-reverse-rotation device for escalators is suitable for escalators installed in shopping malls, supermarkets, stations, airports and the like, has the advantages of simple structure and high reliability, and is not influenced by a control system.