The invention provides an SCR (Selective Catalytic Reduction) denitration catalyst heterogeneous part extrusion die and belongs to the field of SCR denitration catalyst preparation equipment. The SCRdenitration catalyst heterogeneous part extrusion die is characterized in that an extrusion die and an extrusion die fixing disc are arranged on an extruder, wherein the extrusion die is connected with an extruder body through the fixing disc; a fixed bolt through hole is formed in the fixing disc; a fixed bolt hole is formed in the extruder; a fixed bolt passes through the fixed bolt through holeand enters the fixed bolt hole so as to fix the fixing disc on the extruder; an electromagnetic attraction strip is arranged in the fixed bolt through hole; after the electromagnetic attraction stripis energized, the electromagnetic attraction strip can generate magnetic force and fix the position of the fixed bolt in the fixed bolt through hole. When the SCR denitration catalyst heterogeneous part extrusion die is used, the dismountable extrusion die is directly mounted on the extruder; when the specification and the length of the product need to be changed, the production change can be extremely conveniently achieved by only adjusting a telescopic fixed arm; an extrusion head in use does not need to be dismounted and subsequently replaced and mounted. The SCR denitration catalyst heterogeneous part extrusion die can be extremely conveniently and timely adjusted, so that the production efficiency is greatly improved; meanwhile, the labor strength is reduced.