The invention provides a processing device for a local dual-alloy compound aluminum profile. The processing device comprises an extruding machine and a conveying device, wherein the extruding machineis used for processing a first alloy section bar; a mould for forming the first alloy section bar is arranged in the extruding machine; the conveying device is used for conveying a second alloy section bar; the conveying device comprises a coiling plate used for winding the second alloy section bar; the coiling plate is moveably and rotatably arranged; when the first alloy section bar is continuously extruded, the second alloy section bar is continuously conveyed to and compounded on the surface of the first alloy section bar; the second alloy section bar is conveyed by the coiling plate to anextruding outlet of the first alloy section bar; the second alloy section bar is adhered to the surface of the first alloy section bar under the effect of gravity and is bonded to the surface of thefirst alloy section bar under the residual processing temperature of the first alloy section bar, so as to finish the compounding of two alloys. Such a processing manner has the advantages of few andsimple processes, high processing efficiency, low defective percentage, less raw material consumption and low processing cost.