Multistage slide guide rail

The utility model relates to a multistage slide guide rail and belongs to the technical field of hardware members. An inner rail and a middle rail of the guide rail form a movable pair; the middle rail and an outer rail form another movable pair; a transmission part is mounted in the outer rail; a spanner is hinged at the outer end of the outer rail; a limiting sheet is hinged in the middle of the outer rail; the outer end and the inner end of the transmission part are connected with the spanner and the limiting sheet respectively; an elastic part for enabling the inner end of the limiting sheet to lean against the inner wall of the outer rail is mounted at the limiting sheet; a turned edge close to the inner wall of the outer rail is arranged at the outer end of the middle rail; when the spanner is positioned in a first position, the transmission part is positioned in an outer limiting position, and the inner end of the limiting sheet is positioned in a locking position leaning against the inner wall of the outer rail; and when the spanner is positioned in a second position, the transmission part is positioned in an inner limiting position, and the inner end of the limiting sheet is positioned in an unlocking position departing from the inner wall of the outer rail. Due to the adoption of the multistage slide guide rail, the staged operation can be carried out regardless of pull-out or push-in action, so that convenience is brought to operation; and the multistage slide guide rail is simple in structure and very convenient to operate.