The invention discloses a method for improving the magnetic property of oriented silicon steel through laser scribing. In the method, a plurality of parallel line-shaped or dotted line-shaped grooves are scribed on the surface of an oriented silicon steel sheet subjected to high temperature annealing by adopting laser beam, the inclined angle alpha between each line-shaped or dotted line-shaped groove and the rolling direction of the oriented silicon steel sheet is 78 to 88 DEG, the distance d of adjacent line-shaped or dotted line-shaped grooves along the rolling direction of the oriented silicon steel sheet is 3 to 5 mm, the groove depth h is 15 to 30 mu m, and the groove width b is 50 to 65 mu m. The preferable working parameters of the laser beam are that: the diameter D of a light spot is 7 to 13 mu m, and the peak power density N of an irradiation point is 108 to 109 W/cm<2>. By adopting laser scribing, the plate type of the oriented silicon steel sheet is not damaged and iron loss also can be remarkably reduced, the iron loss reduction effect of the laser scribing cannot disappear after stress relieving annealing at the temperature of 800 DEG C for 2 hours, the lamination factor cannot be reduced, and the magnetic induction basically does not worsen. Meanwhile, the process of the method is simple, the production is easy to control, and the method is particularly suitable for improving the performance of the high-magnetic induction oriented silicon steel sheet, and the oriented silicon steel sheet can be used for a wound iron core transformer and also can be used fora laminated iron core transformer after being treated.