The invention discloses a steel strip machining device comprising a transmission part and a heating module as well as a wetting part. The wetting part comprises two wetting rollers, and each wetting roller comprises a liquid discharge pipe and a wetting pad; the liquid discharge pipe is tubular, and the side wall of the liquid discharge pipe is further provided with a plurality of liquid outlets;the liquid discharge pipe is further connected to a liquid distribution part comprising a shell which is internally provided with a sliding bearing, and the position, on the rear end of the sliding bearing, of the shell is further provided with a liquid inlet; and the shell on the front end of the sliding bearing is further internally provided with sealing packing and a pressing end cover. The device is simple in structure, and the utilization rate of bluing chemicals can be improved effectively; and meanwhile the bluing quality is high.