The invention relates to a rubber bar connecting method, a sealing ring machining process and machining equipment. The sealing ring machining process comprises the following steps: two ends of a rubber bar with a length equal to the perimeter of a needed sealing ring are in butt joint, and are connected by using the rubber bar connecting method. The rubber bar connecting method comprises the following steps: (1) gaps are machined in the end parts of the rubber bar; (2) the end parts of the rubber bar are in butt joint; and vulcanized rubber is fed in the gaps; and (3) the butt joint places of the rubber bar are heated for vulcanization, so that the rubber is heated for vulcanization to fuse with the rubber bar to connect with the rubber bar. The rubber bar machined by adopting the machining process is fused through the rubber after heating vulcanization of the connecting places of the rubber bar, so that the connecting strength is obviously improved.