The invention discloses a sectional roller cooling device which comprises a sectional cooling beam and a sectional cooling controller, wherein a row of nozzles which face the surface of a working roller are mounted on the sectional cooling beam; a flow adjusting valve is arranged at each nozzle; a row of temperature sensors corresponding to the nozzles are arranged on the sectional cooling beam; the temperature sensors are connected with the sectional cooling controller; the temperature sensors are used for transmitting working roller surface temperature data detected at regular time to the sectional cooling controller; the sectional cooling controller controls the flow adjusting valve according to the received data; the sectional cooling controller is further connected with a plate shape roller and is used for receiving feedback information about whether the plate shape meets the requirements or not. By the adoption of the sectional roller cooling device, the time delay caused when the plate shape is improved through sectional cooling is eliminated, real-time adjustment on the thermal crown of the working roller is achieved, internal parameters can be modified according to signals fed back through the plate shape roller, and the purpose of precisely adjusting the plate shape is achieved.