The invention discloses a novel automatic aligning roller of a belt conveyer, which comprises two rubber rollers (1), a rubber sleeve (2) and a wabbler mechanism (3), wherein the two robber rollers (1) are symmetrically arranged on the left and on the right, the wabble mechanism (3) is positioned between the two rubber rollers; and the wabbler mechanism (3) consists of a screw (31), a bearing cover (32), a sealing ring (33), an antifriction bearing (34), an inner sleeve (35), a center sleeve (36), an outer sleeve (37), a cylindrical pin (38) and a central pendulum shaft (39). In the novel automatic aligning roller, as a key movement mechanism is concentrated in the wabbler mechanism, and due to the action of the seal ring and the rubber sleeve, the dust-proof and the water-proof effects are more reliable. So that the automatic aligning roller can be used in occasions with severe environment; requirements of different specifications of the belt conveyer can be met by only changing the rubber rollers; and the wabbler mechanism is convenient to maintain, replace and organize production.