A solenoid valve for brake system includes a valve housing installed in a modulator block, and having an oil flow path; a valve seat installed in the inside of the valve housing, and forming an orifice; an armature configured to move up and down by a magnet core in the valve housing, and to open or close the orifice; a sleeve coupled with the valve housing, and accommodating the armature therein; a restoring spring configured to provide an elastic restoring force to the armature to close the orifice normally; and a damper member interposed between the magnet core and the armature.