The invention relates to a steel sheet cleaning device comprising a scrubbing cleaning mechanism, a spraying cleaning mechanism, an ultrasonic cleaning mechanism, a sprinkling mechanism, a water scrapping mechanism and a
drying mechanism, wherein the scrubbing cleaning mechanism, the spraying cleaning mechanism, the ultrasonic cleaning mechanism, the sprinkling mechanism, the water scrapping mechanism and the
drying mechanism are sequentially arranged on one straight line. A steel sheet sequentially passes through the scrubbing cleaning mechanism, the spraying cleaning mechanism, the ultrasonic cleaning mechanism, the sprinkling mechanism, the water scrapping mechanism and the
drying mechanism. Through scrubbing cleaning of scrubbing cleaning rollers, spraying cleaning of spraying heads and ultrasonic cleaning, surface oil stains and impurities of the steel sheet are fully removed,
clean water is sprinkled to the surface of the steel sheet through the sprinkling mechanism, so that thesurface of the steel sheet is cleaner, then through a first squeezing wheel and a second squeezing wheel of the water scrapping mechanism, residual water on the surface of the steel sheet is scrappedoff, a trace amount of water remains on the surface of the steel sheet, and then the steel sheet can be rapidly dried after entering a drying box. By the adoption of the process, the steel sheet is more fully cleaned and is cleaner, the drying efficiency is effectively improved, and the overall cleaning efficiency of the steel sheet is effectively improved.