The invention relates to a double-layer cascade ring packing and belongs to the field of a petrochemical technology. The cascade ring packing is made from metal. The outer wall of the cascade ring packing has a circular shape from a looking-down perspective. First, second and third vanes are arranged respectively between first, second and third points which are 120 degrees spaced on the inner circumference of the outer wall. The inner circumference of the outer wall also has fourth, fifth and sixth points obtained by rotating the first, second and third points 60 degrees. Fourth, fifth and sixth vanes are arranged respectively between the fourth, fifth and sixth points. The first to sixth vanes all have an arc-shaped tongue piece raised towards the outer wall. The first to sixth vanes all have a gap corresponding to the respective tongue piece. The cascade ring packing provided by the invention has a staggered double-layer vanes structure and has good pressure resistance. As the vanes are separated by 120 degrees, gaps between packings are not enough to stack up mutually.