The invention discloses a method for improving the surface quality of inner and outer rings and edge parts of oriented
silicon steel and an annular furnace. In a primary cold rolling process, misalignment crimping is adopted, crimping tension is controlled according to gradual change tension, the crimping tension at the head and the
tail is large, and the crimping tension at the middle part is small; the
coating amount of MgO and the
curling tension change synchronously, the
coating amount of the head and the
tail is small, and the
coating amount of the middle part is large; in the high-temperature annealing process, a
cushion layer formed by evenly distributing a plurality of fan-shaped blocks around the center is additionally arranged on a bottom plate of the annular furnace, gaps exist between the adjacent fan-shaped blocks, and the upper end of a steel coil in an inner cover of the annular furnace is covered with a ventilated cover plate. An inner ring gap of the bottom surface of the cover plate extends into a steel coil hole, an outer ring gap sleeves a steel coil, the middle of the cover plate is supported on the end surface of the steel coil through diversion trenches uniformly distributed around the center, the diversion trenches are spiral, inlets of the diversion trenches are communicated with openings in the inner ring of the cover plate in a one-to-one correspondence manner, and outlets of the diversion trenches extend to the inner side of the outer ring of the bottom surface of the cover plate. The method can obviously reduce surface defects, obviously improve surface quality and
magnetism, and is easy to operate.