The invention belongs to the technical field of rubber sealing elements, and particularly relates to a rubber sealing ring press-cutting forming processing method which is completed by adopting a rubber sealing ring press-cutting forming processing machine in a matched mode. The method comprises the following steps that 1, a rubber sheet is fixed, specifically, the rubber sheet is horizontally placed on the upper surface of a base; 2, vertical cutting is conducted, specifically, a first annular blade and a second annular blade are driven to cut the rubber sheet in the vertical direction; 3, rotary cutting is conducted, specifically, a first annular blade and a second annular blade are driven to rotate in opposite directions, and therefore the rubber sheet is rotationally cut; and 4, returning and stripping are conducted, specifically, the first annular blade and the second annular blade are driven to vertically move upwards. The rubber sealing ring and a rubber wafer automatically fall off under the action of air pressure. The smooth cutting surface is ensured, rotation of the rubber sheet is avoided, and the cutting efficiency is improved; and the rubber sealing ring does not need to be manually taken out by an operator, the efficiency is improved, and injury to the operator is avoided.