The present invention relates to a casting roll crown forming method of the twin roll casting sheet metal, in the method of twin roll casting roll crown formed sheet metal casting machine; Twin roll first stage considering the trimming amount during strip casting using a casting machine for holding the sheet crown of the sheet to less than 50mm, based on the point from the edge of the thin plate and 90㎛; Initial casting roll crown is given to the casting roll surface is a crown amount of rain to the crown quantity, it edges from the casting roll central portion 50mm point of up to 50mm point from the casting roll edge 1: characterized in that comprising a second step of maintaining the 1.2 pair provides a method for forming the casting roll crown roll type casting machine for sheet metal. By the method of twin roll casting roll crown formed sheet metal casting machine according to the present invention, it is possible to obtain a better thin edge-like, and further may also the widthwise crown of the thin plate rolling quality can be obtained an effect of obtaining a good result. Strip casting, stainless steel, cast roll crown