The invention discloses an escalator. When an emergency happens in the middle of the escalator, the escalator can be effectively stopped emergently to avoid personal injury accidents. The escalator comprises a first scram button, a second scram button and a third scram button, wherein the first scram button and the second scram button are respectively arranged on an upper passageway end and a lower passageway end, and the third scram button is arranged in the middle of the escalator.