Support structure for inner cylinder of chimney

The invention discloses a support structure for an inner cylinder of a chimney. The chimney comprises an outer cylinder and at least one inner cylinder suspended inside the outer cylinder. The support structure comprises two first trusses which are positioned inside the outer cylinder and arranged opposite to each other; the two first trusses comprise first upper chords and first lower chords respectively; the first upper chords are supported on the inner wall of the outer cylinder; at least two suspending beams are arranged between the two first upper chords; the suspending beam and the first upper chord encircle and form at least one suspending frame matched with the outer circumference of the inner cylinder; at least two support beams are arranged between the two first lower chords; the support beams and the first lower chords encircle and form support frames which are matched with the outer circumference of the inner cylinder and correspond to the suspending frames one to one; one end of an inserting beam