The invention discloses a double-row spherical roller bearing with a T-shaped locking device, comprising the inner ring of the bearing, the outer ring of the bearing and two rows of rollers, wherein a shroud extends out of one side of the inner ring of the bearing; the inner wall corresponding to the shroud, of the section of the inner ring is provided with a plurality of slots; the outer wall of the shroud is provided with a locking ring with an opening; and the opening of the locking ring is provided with an opening locking structure capable of drawing and locking the opening. Because the roller bearing is disassembled and assembled by clamping or loosening the inner ring of the bearing through the locking device arranged on the inner ring of the bearing, the roller bearing is convenient to install, disassemble and assemble and has even and reliable locking force to ensure concentricity and reliability for installing the roller bearing so as to improve rotation precision. The double-row spherical roller bearing is suitable for long-axis intermediate support under heavy load and application occasions which have rigorous conditions and always need to be replaced and maintained, such as outdoor dustiness, wateriness, much pollution and the like.