The invention discloses a cold-processing molding method of a thin-diameter thin-wall aluminum alloy tubular product. The method comprises the following steps: (1) recrystallization annealing quenching tempering: adopting a vacuum furnace or a resistance furnace under protective atmosphere to carry out recrystallization annealing quenching tempering on an aluminum alloy tube blank; (2) surface lubrication: uniformly coating a layer of MoS2 emulsion lubricant or graphite emulsion lubricant on the outer surface of the aluminum alloy tube blank after the recrystallization annealing quenching tempering; (3) drawing and molding: adopting drawing equipment to carry out multi-die drawing treatment on the aluminum alloy tube blank after surface lubrication until obtaining an thin-diameter thin-wall aluminum alloy tubular product to be molded; and (4) subsequent treatment: carrying out surface cleaning, straightening and scaling treatment on the thin-diameter thin-wall aluminum alloy tubular product molded by drawing and obtaining a finished thin-diameter thin-wall aluminum alloy tubular product. The invention has simple processing steps, convenient implementation, low processing cost andgood processing effect and can effectively solve the problem for processing the thin-diameter thin-wall aluminum alloy tubular product.