The invention discloses a photoelectric keyboard key, which comprises a circuit board, an optical coupling assembly, a key seat, a pressing shaft, and a punch hammer, wherein the circuit board is used for providing circuit connection, and the circuit board is provided with a mounting hole; the optical coupling assembly is arranged on the circuit board and comprises a transmitting element and a receiving element arranged at the mounting hole side; the key seat is arranged in the mounting hole, is opened from top to bottom to form a guiding basket, and the side wall of the guiding basket is provided with a light pass groove for enabling the transmitting element and the receiving element to form a light path; the pressing shaft is arranged in the guiding basket and can slide up and down along the guiding basket; the punch hammer is vertically arranged in the guiding basket, the upper end and the lower end are connected with the pressing shaft and the guiding basket respectively via a spring, the side surface of the punch hammer is provided with a dial block connected with the pressing shaft, the punch hammer is provided with a light path switch, the punch hammer is pushed by the dial block to rotate in a reciprocating and horizontal mode when the pressing shaft is pressed or bounced for rotating the light path switch to conduct or block the light path between the transmitting element and the receiving element. An obvious click and a key sound can be presented, the coupling efficiency is higher, and dusk is not likely to be accumulated.