The invention discloses a row sheet type cylinder lock and a key thereof. A lock core is arranged in a lock housing; a plurality of row sheet grooves which can be respectively used for arranging row sheets and elastic pieces are annularly formed on the lock core at intervals; a plurality of tooth grooves respectively corresponding to the row sheets are annularly formed at intervals on a sleeve arranged at the front end of the key; and when being inserted into the cylinder lock, the key can drive the row sheets to move at unequal distances, so as to unlock the lock. By adopting the invention, members needed for manufacturing locks can be simplified, and the purpose pf convenient processing and assembly can be effectively achieved.