The invention relates to a preparation method for a steel plate, which belongs to the technical field of
metal plate preparation. The preparation method comprises the following steps of: firstly, adding
raw material into a
smelting container; heating steel leftover materials in the
smelting container to the steel
smelting temperature; in an air-pressure or self-weight mode, steel solution in the smelting container drips down from a
small hole on the bottom of the smelting container to
overlay and cover the steel solution on a plate blank; at the same time that the steel solution is overlaid and covered on the plate blank, a steel
metal layer is subjected to
thermal mechanical processing while being overlaid and covered; the
crystal grain of the overlaid and covered steel
metal layer tissue is refined to obtain a prefabricated steel plate blank of a
fine grain tissue; and the prefabricated steel plate blank is subjected to
machining to obtain the steel plate. The method disclosed by the invention has a low requirement on the raw materials, the raw materials can be abandoned materials, such as steel leftover materials, bar stocks, plate materials and the like, and therefore the production cost is greatly lowered. The technical process is greatly shortened, the production efficiency is greatly improved, and the
fine grain steel plates of various ingredients, sizes and shapes can be prepared.