The invention belongs to the technical field of numerical control processing, and relates to a numerical control processing method of a thin-wall aluminium honeycomb part. The method comprises the following steps that: a tool is longitudinally adhered with double-faced adhesive tape, and a part to be processed is adhered to the tool through the double-faced adhesive tape; an arc groove can be formed by the cutting of a ball-end cutter with the spiral angle being 10-17 degrees, cutting is carried out in the area between two ends of the part to be processed, and a certain processing allowance can be retained at the two ends; the thickness allowance at a reverse surface can be removed; when the thickness allowance at the reverse surface can be removed, according to the thickness allowance, the removal of the thickness allowance can be finished with one-step cutting when the thickness allowance is not larger than 8mm; when the thickness allowance is larger than 8mm, the removal of the thickness allowance is required to be processed in two layers; and finally, the processing allowance at the two ends can be removed. According to the invention, the problem that the thin-wall aluminium honeycomb part is easy to be broken is solved, the processing abandonment of the part is reduced, the reliability and the stability of the product are increased at a large extent, the processing quality of the part and the finished product rate of the product are ensured, and the numerical control processing method has larger actual application value.