Production method for improving longitudinal magnetic property uniformity of low-temperature high-magnetic-induction oriented silicon steel coil

The invention discloses a production method for improving longitudinal magnetic property uniformity of a low-temperature high-magnetic-induction oriented silicon steel coil. The production method comprises the following steps: smelting in a converter, performing RH refining treatment, and performing continuous casting protection pouring to form a plate blank; the plate blank is hot-rolled after being heated; wherein the heating temperature ranges from 1120 DEG C to 1250 DEG C, the temperature after finish rolling is larger than or equal to 920 DEG C, and rapid water cooling is conducted to 600 DEG C or below after finish rolling; the hot-rolled plate is subjected to one-time cold rolling to the target thickness after being subjected to conventional two-section type normalizing, and then decarburization annealing and nitriding treatment are conducted; coating the nitrided steel coil with a magnesium oxide separant, and performing high-temperature annealing in an annular furnace; after high-temperature annealin