The invention belongs to the field of iron and steel manufacture and particularly relates to an ultra-low carbon oriented silicon steel plate and a preparation method thereof. The ultra-low carbon oriented silicon steel plate comprises the following chemical components in percentage by mass: less than 0.003% of C, 2.8-3.4% of Si, 0.05-0.20% of Mn, 0.015-0.03% of S, less than 0.01% of P, less than 0.004% of O, 0-0.6% of Cu, 0-0.2% of Sn and the balance of Fe. The manufacturing method comprises the following steps: smelting; continuously casting by double rollers; normalizing; pickling; cold-rolling for the first time; annealing in the mid; cold-rolling for the second time, recrystallizing and annealing for the first time; coating an MgO separant; annealing at a high temperatures; and coating an insulating layer. Based on double roller thin-strip casting technology, hot rolling and decarbonizing steps in the conventional production flow are canceled by adopting an ultra-low component design. The adopted process is simplified and stable, is contributive to lowering the production cost, energy consumption and pollutant emission. The process is a low-cost and short-flow manufacturing method of the oriented silicon steel plate. The obtained ultra-low carbon oriented silicon steel plate satisfies the use requirements.