The invention provides a catalyst post-processing assembly. The catalyst post-processing assembly includes a drying box; an electric control box is arranged on an outer side of the drying box; an operation panel is arranged on the electric control box; an elliptic drying chamber is arranged in the drying box; a discharging opening is formed in the drying chamber; one side of the drying chamber is connected to a first connection shaft, and the other side of the drying chamber is connected to a second connection shaft; the first connection shaft is rotatably connected to an inner wall of the drying box through a rotation shaft; the second connection shaft is rotatably connected to an inner wall of the drying box through a rotation shaft; the first connection shaft sleeves an air inlet pipe which communicates with the drying chamber; and the second connection shaft sleeves an air outlet pipe which communicates with the drying chamber. The elliptic drying chamber is arranged in the drying box, the drying chamber is connected to the rotation shafts, the air inlet pipe and the air outlet pipe so as to evenly mix and dry a catalyst; the catalyst post-processing assembly has an excellent drying effect, is simple in discharging, and can ensure that the catalyst is always dry in the discharging process.