The invention discloses a motorcycle air filter provided with a detachable fire-proof plate. The motorcycle air filter comprises an air filter casing and a filter element component fixing plate arranged on the casing, wherein the fire-proof plate and a filter element component are arranged in the opening position of the filter element component fixing plate; a limit structure is arranged on the periphery of the opening and limits the fire-proof plate on the filter element component fixing plate; the filter element component comprises a filter element frame and a filter element, and the filter element frame is provided with a plurality of limit posts which are bulged towards an end surface of the fire-proof plate; and when the filter element component is mounted and fixed on the filter element component fixing plate, the limit posts compress the end surface of the fire-proof plate and locate the fire-proof plate in the limit structure in the opening position of the filter element component fixing plate. According to the motorcycle air filter provided with the detachable fire-proof plate, on one hand, a shaking problem which is easily produced by the limit is avoided while assembling problem of the fire-proof plate is solved, on the other hand, when the air filter is maintained, the fire-proof plate not only can be reused to reduce the maintenance cost, but also can be detached conveniently, and dust accumulated in a clean cavity of the air filter can be cleaned out.