The invention relates to a cable shaft fire-fighting device and method. A vertical fire-fighting pipe and a lower exhaust device are mounted in a shaft; a fire-fighting valve is provided with fire-fighting spray heads in a layered manner; an isolation smoke control baffle is arranged between cables; and a fire-fighting device controlled by a bimetallic strip is mounted at the lower part of a hoistway door. In the case of fire, physical isolation between the cables and air can be realized; the cable shaft fire-fighting device is widely applied to the fire prevention of a cable shaft, and the safety index of the cable shaft is increased; and moreover, the product realized by the technology can be produced in an industrial, standard, general and serial manner, and the technology belongs to the fields of building fire prevention and electric fire prevention.