The invention discloses a coded wheel padlock. The coded wheel padlock comprises a lock body and a lock beam. A coded wheel lock cylinder and a latch hook are arranged on the lock body, the lock beam comprises a fixed end fixed to the lock body and a tapered end, the latch hook is matched with the tapered end, the coded wheel lock cylinder comprises a plurality of coded wheel sets and a lock bar, each coded wheel set comprises a cam of a character wheel, each cam is driven by the corresponding character wheel to rotate, a limiting boss is arranged on the inner ring of each cam, and a cam installation through groove is formed in each limiting boss; each limiting boss is provided with slopes and a C-shaped locking face, wherein the slopes are located on the two sides of the corresponding cam installation through groove, and the C-shaped locking face is located at the portion without the slopes and the corresponding cam installation through groove. Protruding blocks coincident with the cams in number are arranged on the lock bar, when the protruding blocks on the lock bar are matched with the slopes on the corresponding cams, the coded wheel lock cylinder is unlocked, and when the protruding blocks on the lock bar are matched with the C-shaped locking faces on the corresponding cams, the coded wheel lock cylinder is locked. The coded wheel padlock has the advantages of being simple in structure, high in reliability and low in cost.