The invention discloses a U-shaped spiral directional coded antitheft lock with a lock cylinder. The U-shaped spiral directional coded antitheft lock is designed with a side locking piece and provided with a plurality of round blind holes at intervals and a cross arm; a lock cylinder plate is arranged on the cross arm; the lock cylinder is arranged on the lock cylinder plate; the side locking piece is connected and fixed with the cross arm; a U-shaped ring is arranged; one end of the cross arm is clamped in the right upper end of the U-shaped ring and connected with a rotating pin, and can be turned upwards; a frame is arranged and connected with one end, where the lock cylinder plate is arranged, of the cross beam by use of a hinge, and the frame can be reversed; an upper fixed block, a lower fixed block and inner inserts are arranged in the frame; a plurality of through holes are formed in the end face of the upper fixed block, and the diameter of each through hole is smaller than the thickness of a disc or the travel distance of one through hole is about 3mm; a plurality of left-handed and right-handed screws are arranged; code digitals are formed on the disc and can be arranged not in order. The U-shaped spiral directional coded antitheft lock with the lock cylinder is provided with changeable codes and the lock cylinder which does not need to be changed frequently, and only locking codes and unlocking codes need to be remembered; the anti-theft lock is pickproof and sawing-resistant, has a dual-lock function and is safer.