Net hole forming extruder and SCR catalyst manufacturing process based on extruder

The invention discloses a net hole forming extruder and an SCR catalyst manufacturing process based on the extruder. The net hole forming extruder comprises a die section, a pressure equalizing section, a micro-compression section, a square round corner section, a transition section I, a pressure equalizing plate, a transition section II, a supporting plate, an extruding forming section and an extruding screw rod; the die section, the pressure equalizing section, the micro-compression section, the square round corner section, the transition section I, the pressure equalizing plate, the transition section II, the supporting plate, the extruding forming section and the extruding screw rod are connected in sequence. The SCR catalyst manufacturing process based on the extruder comprises the following steps of preparing materials, mixing, detecting for the first time, aging for the first time, filtering, pre-extruding, aging for the second time, extruding, forming, drying for the first time, detecting for the seco