The invention discloses a double-half-outer-ring self-aligning roller bearing for a stirring vehicle. The double-half-outer-ring self-aligning roller bearing comprises an inner ring, an outer ring, self-aligning rollers, a connection ring 5, two retainers and a movable middle space ring. The outer ring is composed of two half outer ring bodies which are fixed through the connection ring. The inner ring and the outer ring are both of an annular structure and are concentrically arranged. The two retainers are concentrically arranged on the inner ring in parallel. The retainers are provided with a plurality of rectangular pocket holes, the self-aligning rollers are arranged in the rectangular pocket holes, and the movable middle space ring is arranged in a narrow space defined by the inner ring, the two rows of self-aligning rollers and the two retainers. The double-half-outer-ring self-aligning roller bearing has the advantages of being high in loading capacity, large in self-aligning angle, long in service life, high in reliability and the like.