The invention belongs to the technical field of metallurgy and particularly relates to a method for preparing a developed {100} texture non-oriented silicon steel thin belt based on thin belt continuous casting. The method is performed according to the following steps that firstly, molten steel is smelted according to the set components, and the components comprise, by weight percentage, 0.01-0.05% of C, 1.5-3.0% of Si, 0.2-0.3% of Mn, smaller than or equal to 0.005% of Al, 0.01-0.04% of V, 0.002-0.005% of S and the balance Fe and inevitable impurities; secondly, a cast belt is formed after the thin belt continuous casting process; thirdly, hot rolling is performed under the inert atmosphere condition; fourthly, scale is removed in a pickling manner, and then single-stage or two-stage cold rolling is performed; and sixthly, two-stage re-crystallization annealing is performed, an insulating coating is coated and dried, and high-performance non-oriented silicon steel is obtained. According to the method for preparing the developed {100} texture non-oriented silicon steel thin belt based on thin belt continuous casting, on the basis of partially utilizing the inherited effect of a {100} texture in an initial solidifying structure, the driving force is provided by means of a subsequent decarburization phase change, it is promoted that a developed {100} texture is formed in a finished product plate, and therefore the high-performance non-oriented silicon steel is obtained.