The invention discloses a multi-gear ignition lock. The multi-gear ignition lock comprises a lock body, a lock core, a gear base and a rotor assembly arranged in the gear base, wherein the lock core and the rotor of the rotor assembly are set in a linkage manner; a bump is arranged at one end, positioned in the lock body, of the lock core; an annular lug boss matched with the bump for preventing the lock core from separating out is arranged on the inner wall of a lock core hole of the lock body; a notch used for allowing the bump to be inserted in or sliding out is formed in the annular lug boss; the bump passes through the notch in a rotary manner and then is matched with the annular lug boss to form limiting matching; convex ribs are arranged on the inner wall of the lock core hole; a check block, which is matched with the convex ribs for preventing the bump and the notch from being aligned, is arranged on the end plane, towards the lock core, of the rotor; and the bump and the check block are matched with the convex ribs separately to form limiting rotation of the lock core. By adoption of the structure, the multi-gear ignition lock with convenient assembling and disassembling, optional number of gears, small size and reasonable structure can be provided.