The invention relates to a production technique of a high-accuracy cold-rolling carbon-steel steel belt for the electronic industry, comprising the following steps: pickling the raw materials, cold rolling primarily, cutting edges, spraying and degreasing, annealing in a cover type manner, cold rolling secondarily, stretching crookedly and straightening and cutting into a finished product. The production technique adopts a four-roller high-accuracy reversing rolling machine and a unique rolling technique to conduct cold rolling, leads the product to has little thickness tolerance fluctuation,stable performance, uniform and consistent surface color, and no defects of color difference, scratching, slip line and the like, good plate-shaped flatness and straightness by the techniques of degreasing, annealing in a cover type manner, stretch bending and straightening, and the like, remarkably improves the product quality, is suitable for industrialized production, meets the high-quality requirements of the electronic industry, replaces stainless steel materials, and reduces the cost.