Coded lock of casement window

The utility model relates to the technical field of casement window locks, in particular to a casement window coded lock which comprises a base, a shifting piece connected to the base in a sliding mode and a spring bolt fixedly connected to the shifting piece, a code wheel is connected into the base in a rotating mode, the code wheel is provided with a through hole, an opening is formed in the outer side of the through hole, the spring bolt is fixedly connected with a rotating shaft, and the rotating shaft is fixedly connected with the base. The end, away from the spring bolt, of the rotating shaft penetrates into the through hole, a protruding block corresponding to the opening is arranged in the middle of the outer side of the rotating shaft, the code wheel is arranged in the base, the code wheel and the rotating shaft are matched to abut against the spring bolt, the spring bolt cannot slide and retract, and therefore the back locking effect is achieved; the unlocking difficulty after back locking is increa