The invention relates to a lockset, in particular to an infrared light-operated coded lock. The infrared light-operated coded lock comprises a single-headed infrared light-operated emitter, a single-headed light-operated lock front plate, a single-headed light-operated lock rear plate and a single-headed light-operated lockset, wherein the invisible light beam emitted by the single-headed infrared light-operated emitter is transmitted to the single-headed light-operated lock front plate, and an interval with width equal to the thickness of an installing door is left between the single-headed light-operated lock front plate and the single-headed light-operated lock rear plate. The infrared light-operated coded lock has the beneficial effects of conducting data transmission by adopting optical fiber through a serial mode, improving the secrecy and damage prevention capability of the lock as the data receiving exposed part of the locket is extremely less, enhancing the data unpredictability and having extremely high security by adopting 24 non-repeated random cipher digits. In addition, more or less single-headed infrared light-operated emitters can be allowed to be operated, and the specific number is determined by memory capacity, so that the application range and purposes of the lock are expanded.