The invention provides softening steam for treating wicker and relates to the technical field of production of wicker-woven products. The softening steam is prepared through cooking the following raw material ingredients in parts by weight with water: 2-4 parts of alcohol, 3-7 parts of toilet water, 4-8 parts of boric acid, 1-3 parts of datura flower, 2-4 parts of lavandula angustifolia, 2-4 parts of cassia twig, 1-3 parts of dahurian rhododendron leaf, 3-5 parts of cordate houttuynia, 2-4 parts of jasmine flower, 4-8 parts of gardenia flower and 5-8 parts of Chinese honeylocust fruit. According to a treatment method, living wicker is treated firstly, the method is simple, insect proofing, moth proofing and mildew and rot proofing effects on the wicker are achieved, and the service lives of the wicker-woven products can be prolonged; the prepared softening steam plays a role in softening the wicker, and volatile substances contained in the steam can also be used for sterilizing and flavoring the wicker.