The invention relates to a pneumatic conveying device. The pneumatic conveying device comprises a barrel and a tapered ash bucket. An airflow inlet is formed in the side wall of the ash bucket. An airflow distribution device is arranged above the part, in the ash bucket, of the airflow inlet and comprises a mounting frame and a baffle. The mounting frame is obliquely arranged on the part, below the airflow inlet, of the inner wall of the ash bucket. The baffle is arranged on the part, at the upper end of the airflow inlet, of the inner wall of the ash bucket. One end of the baffle is connected with the inner wall of the ash bucket. The other end of the baffle is connected with the mounting frame. When airflow passes through the baffle, certain partitioning is formed, the airflow suffers certain resistance accordingly, and impact force of powder to a filter bag in a filter can be reduced, so that the airflow is distributed more evenly after entering the filter, the dust removing function on all parts of a dust remover can achieve the same effect advantageously, local severe abrasion is avoided, and the dust removing effect is improved.