The invention relates to a cold extrusion forming process for a high-strength aluminum alloy tapered thin-wall part, in particular to a cold extrusion forming process for a high-strength 7A04 aluminum alloy conical thin-wall part, which comprises steps as follows: feeding 7A04 aluminum alloy material into a rod processing machine; performing annealing treatment, surface oxidation and lubricating treatment before extrusion; performing forward extrusion for shaping; extruding a taper hole for the first time; extruding a taper hole for the second time; performing solution treatment; performing aging treatment; and shape machining. The process has the advantages of high production efficiency, low production cost, low material consumption, high product quality, and applicability to industrial production. The taper hole is formed by an extrusion die, so that the dimensional accuracy and the position accuracy thereof are high, and the production process requirements can be met.