The invention discloses an extrusion supporting device of a denitration catalyst, and belongs to the field of equipment parts for preparing denitration catalysts. The extrusion supporting device is characterized in that the extrusion supporting device comprises a conveyor belt, a plurality of wedge-shaped supporting blocks are fixed to the conveyor belt, and air vents are formed in the wedge-shaped supporting blocks and communicate with an air pump through vent pipes. According to the extrusion supporting device of the denitration catalyst, effective non-friction supporting can be provided forthe extruded soft denitration catalyst through airflow supporting, so that the production quality of finished products is higher; and the problem that the transmission direction of the denitration catalyst is wrong and the denitration catalyst is damaged caused by collision due to wrong steering and other problems of the extrusion supporting device can be further avoided through guiding equipment.