The invention relates to the field of material machining, and discloses a production method for preparing thin-specification high-magnetic-strength oriented silicon steel through a low-temperature hot rolled plate. The method comprises the steps of S1, hot rolling, S2, normalization heat treatment, S3, cold rolling, S4, decarburization annealing treatment, S5, coating a MgO coating on the surface of a cold rolled plate, and S6, high-temperature annealing treatment. The high-temperature annealing treatment comprises the steps that a cold rolled plate is placed in heat treatment equipment to be heated up at the first rising rate, and when the temperature reaches 850 DEG C to 870 DEG C, NH3 begins to be led to the heat treatment equipment; and when the temperature reaches the first temperature, the NH3 is stopped from being led into the equipment, and then, the temperature rises to the second temperature at the second temperature rising rate and is kept warm. A nitriding step is combined into the high-temperature annealing treatment process, the nitriding step obtained after decarburizing annealing is omitted, and energy is saved; in the high-temperature annealing stage, nitriding and high-temperature secondary recrystallization can be completed at one time, the production technology is simplified, and the production cost is saved.