The invention relates to a strip steel casting device and a casting method. The casting device has a narrow sidewall with cooling and a crystallizer of a wide sidewall, wherein, on a shape specified parallel section of the wide sidewall and in order to arrange a casting pipe, a crystallizing pipe is provided with a casting passage that upwardly extends. Within the casting method, the method that no residues for the strip steel is generated and the shorter casting time achieved is: without considering the height of the metallic liquid surface (1) inside a pipe mould, a casting blank begins to be guided out between the place of that the parallel section (10) with specified shape of the crystallizer (5) is filled up and the place of that an outlet (15) of the casting pipe is covered. Finally the minimum guiding out speed is realized when reaching the specified height of the metallic liquid surface inside the pipe mould. Under the minimum guiding out speed, the metallic liquid terminal keeps under the parallel section (10) with the specified shape. |