Filter brick for denitrification filter

The utility model discloses a filter brick of a denitrification filter tank, and relates to the technical field of water treatment. The device comprises a supporting shell, connecting blocks are fixed to the two sides of the top of one end of the supporting shell, fixing sleeves are fixed to the two sides of the top of the other end of the supporting shell, the connecting blocks are slidably connected with the fixing sleeves, and two connecting holes and a plurality of positioning holes are formed in the positions, located at the bottoms of the connecting blocks, in the two ends of the supporting shell. The two connecting holes are symmetrically formed in the two sides of the supporting shell, the positioning mechanism is assembled in the two connecting holes in one end, the gap filling mechanism is installed in the positioning hole in one end, the gap filling mechanism is composed of a fixing column, displacement columns, reset springs, a positioning ring and a fixing shell, and the displacement columns are