In this paper, the effects of pitch and spiral diameter on the forming process of 6061 aluminum alloy spiral tube are studied by numerical simulation and experiment. It is found that when the pitch is constant, the increase of the spiral diameter will reduce the cross-section distortion of the spiral tube; When the spiral diameter is constant, the increase of the pitch will aggravate the cross-section distortion of the spiral tube, and the outward offset of the neutral layer of the wall thickness will gradually decrease as the spiral radius increases. Based on the numerical simulation results, the actual spiral tube forming effect is good, the spiral is smooth and close to the standard circle, and the appearance size and section distortion are in good agreement with the numerical simulation results. It is a good proof of the good predictability of the numerical simulation for the actual experiment.