The invention relates to a method for preparing a high-silicon silicon steel sheet through an electric spark silicon infiltration technology, and belongs to the technical field of silicon steel surface treatment. The method includes the following steps that the silicon steel sheet serving as an anode and a silicon electrode serving as a cathode are soaked in a working solution in a working solution trough of a numerical control electric spark forming machine, and the anode and the cathode are connected with a pulse power source; the peak current, the pulse width and the pulse interval are adjusted after the power source is turned on, and the power source is turned off 30-180 seconds after working; and the anode is taken out of the working solution and dried, so that the high-silicon silicon steel sheet is obtained. The method is high in production efficiency, low in cost, safe, environmentally friendly and capable of achieving scale production easily; and the silicon content of the prepared high-silicon silicon steel sheet can be 8wt%-11wt%, and the iron loss and the magnetostriction coefficient are quite low.