The utility model discloses a corridor-shaped configured underground nuclear power station in a cavern group of a nuclear island, which comprises the nuclear island that generates steam by means of nuclear fission energy. The nuclear island is arranged in an underground cavern group. In the underground cavern group, a reactor workshop cavern for placing a reactor workshop is arranged at the central part, and an auxiliary workshop cavern group for placing auxiliary workshops is oppositely configured at two sides of the reactor workshop cavern, thereby forming a corridor structure. According to the corridor-shaped configured underground nuclear power station, workshops of the nuclear island are configured underground for forming the corridor-shaped structure, thereby reducing number of caverns in underground nuclear island cavern group, evading direction of an adverse rock layer and large main stress direction of a crustal stress, and realizing benefit for stability of wall rock.