The invention provides a production method for rolling a super-thick steel plate of the limit specification through a continuous casting billet and belongs to the technical field of steel plate techniques. According to the production method, through reasonable composition design and strict control over technological procedures including RH vacuum degassing, continuous casting, steel billet stack cooling, rolling and water cooling, and steel plate stack cooling, the low-alloy super-thick steel plate with the thickness being larger than or equal to 200 mm and with performance and flaw detection guaranteed is produced through the continuous casting billet. The production method has the advantages that low-cost composition design and strict technological parameter control are adopted, and compared with the mode that the super-thick steel plate is produced through a cast ingot, the production cost is substantially reduced.