The invention discloses a method for preparing a silicon solar array electrode by electro-brush plating, which comprises the steps of: (1) coating of a protective film; (2) laser grooving; (3) surface activation treatment; (4) electro-brush plating: a general electroplating power supply is adopted; a cathode of the power supply is connected with a pretreated silicon semiconductor; an anode of thepower supply is connected with an plating pen immersed with a plating solution; the power supply is started; the electro-brush plating is carried out on the plating pen on the surface of the pretreated silicon semiconductor; and the plating pen is a mobile plating pen or a pictographic plating pen; and (5) the removal of the protective film. The invention obviously enhances the production efficiency by adopting the electro-brush plating and realizes the preparation of the array electrode within a shorter time; the prepared electrode is uniform and bright; at the same time, the electroplating bath solution has easy maintenance; the electrode has high bonding strength with a base body and plating layers have high bonding force, thereby reducing contact resistance between the base body and aconducting wire; and the invention has good automatic degree, high electroplating speed, simple technological operation, easy mastery, relatively lower cost, high efficiency and less required toolingequipment.