An oriented high silicon steel strip and an efficient annealing-mode preparation method thereof belong to the technical field of metallurgy. The oriented high silicon steel strip comprises the following ingredients (by weight): 4.5-7.0% of Si, C being less than or equal to 0.1%, 0.005-0.05% of Als, 0.003-0.01% of N, 0.03-0.3% of Mn, Cu being less than or equal to 0.5%, 0.003-0.035% of S, 0.02-0.4%of Nb, 0.005-0.1% of V, and the balance Fe and impurities. The method comprises the following steps: casting according to the composition design to obtain a slab, hot-rolling, carrying out acid pickling, cold-rolling after acid pickling, carrying out decarburizing annealing on the slab, carrying out nitriding treatment, and finally carrying out secondary recrystallization annealing. By controlling an inhibitor system, the rolling technology and the annealing technology, short-process annealing-mode preparation of the oriented high silicon steel is realized, production efficiency is raised, production cost is reduced, and the product has excellent comprehensive performance and is thinner in thickness.