The invention relates to a lock photoelectric key digital coder, which comprises an optical control lock and a photoelectric key, wherein a circuit board A is arranged in the photoelectric key, an integrating block integrated circuit (IC) is arranged on the circuit board A, and an integrating block is connected with a power supply through a switch K. The lock photoelectric key digital coder is characterized in that one side of the circuit board A is transversely designed with 1-to-N-pin reverse charging diode coding input foil copper wires B, the end parts of each reverse charging diode coding input foil copper wire B are connected with a reverse charging diode D, each reverse charging diode D is connected with the integrating block IC, the other side of the circuit board A is vertically designed with 0-to-9-pin light emitting diode coding foil copping wires E, the end parts of each light emitting diode coding input foil copper wire E are connecting with a light emitting diode F, coding connecting holes G are made in the circuit board A, the crossing part of each vertically designed light emitting diode coding foil copper wire E and each transversely designed reverse charging diode coding input foil copper wire B is connected through the coding connecting holes G, 0-to-9-pin photosensitive devices L are arranged in an optical control lock, and each light emitting diode F corresponds to each photosensitive device L.