Special-shaped plum hole furnace grate and air heating furnace checker brick supporting system

The invention relates to a special-shaped plum hole furnace grate and an air heating furnace checker brick supporting system. The special-shaped plum hole furnace grate comprises a furnace grate whichis cast and formed integrally; the furnace grate is divided into an upper section, a middle section and a lower section in the height direction; a plurality of tricuspid plum holes are uniformly distributed in the upper section; a plurality of diameter-reducing circular holes or diameter-reducing tricuspid plum holes are uniformly distributed in the middle section and the lower section; the centres of the diameter-reducing circular holes or the diameter-reducing tricuspid plum holes are arranged in one-to-one correspondence with the centres of the tricuspid plum holes; the hole shape arrangement direction of the diameter-reducing tricuspid plum holes is consistent with the hole shape arrangement direction of the tricuspid plum holes; and the diameters of the diameter-reducing circular holes or the inner diameters