The utility model discloses an aerosol distribution device. The aerosol distribution device comprises a gas-solid mixer (10), wherein the inlet of the gas-solid mixer (10) is connected with a gas delivery pipeline (20) and a dust delivery pipeline (30) respectively, and the outlet of the gas-solid mixer (10) is connected with a distributor (40); valves are arranged on the gas delivery pipeline (20) and the dust delivery pipeline (30), as well as between the gas-solid mixer (10) and the distributor (40) respectively. The aerosol distribution device is suitable for diffusion of arbitrary solid powders that can conduct gas diffusion; by the regulation of the flow and pressure of gas, aerosols of different concentrations can be formed in diffusion space.