The present invention provides a snowboard binding, including a mount, rear plate, top plate assembly base, rotary top pressboard, trigger support and coupling plate. The coupling plate, the mating frame of the rotary top pressboard, the mating ends of the trigger support and the top plate assembly base are coupled together to form a four-bar mechanism. The pressing state of the rotary top pressboard can be positioned directly by the perpendicular trigger support, and the rotary top pressboard can realize an expanded opening state over 90°. Thus, the snowboard boot can be slipped directly into the snowboard binding, enabling more convenient locating and release of the snowboard binding with better efficiency and applicability.