Processing technology of bast fiber four-way stretch fabric

The invention belongs to the technical field of textile printing and dyeing, and particularly relates to a processing technology of a bast fiber four-way stretch fabric. Singeing, desizing and scouring, oxygen bleaching, dry setting, re-bleaching, liquid ammonia treatment, whitening washing, formaldehyde-free non-ironing treatment, tentering and preshrinking are conducted on the fabric; in the formaldehyde-free non-ironing process, formaldehyde-free non-ironing resin, a formaldehyde-free non-ironing catalyst, an elastic memory agent and a fiber protective agent are adopted for treatment. Cotton bale elastic yarn is used in the warp direction of the fabric, and hemp and Sorona blended yarn is used in the weft direction of the fabric. The cotton bale elastic yarn is cotton bale Lycra yarn. As the liquid ammonia is smaller than water molecules, the liquid ammonia can rapidly permeate into the fibers after finishing, the crystallinity and molecular structure of the fibers can be improved, and the non-ironing perf