The invention discloses a casting blank transverse moving mechanism, which comprises a transverse moving trolley and a drive device which are connected. The casting blank transverse moving mechanism is characterized by also comprising a sliding rail arranged between roller ways and a guide rail arranged above the sliding rail, wherein the transverse moving trolley is positioned on the guide rail and can move along the guide rail; and at least two push heads are arranged on the transverse moving trolley and a casting blank is moved from one roller way to the other roller way by the push heads in a relay way. In the invention, the transverse moving trolley with the push heads travels back and forth on the guide rail to push the casting blank on the sliding rail and the casting blank is moved from a primary roller way to a secondary roller way by a plurality of push heads in a relay way. The casting blank transverse moving mechanism has a simple and compact structure, occupies a small space, has a high speed, a short period and high efficiency, is flexible, moveable and suitable for moving the casting blanks of various thickness specifications and specified lengths, particularly ultra-short cut-length casting blanks, and can greatly improve blank production efficiency.