The invention discloses a rapid rooting method for olive cutting slips. A composite rooting solution is used for soaking cutting slips in the cutting process, and materials of gamma-polyglutamic acid,dopamine hydrochloride and nano chitosan and the like are added into the rooting solution on the basis of taking indoleacetic acid as an exogenous hormone growth regulator, so that high-activity gel-like thin films can be formed at the roots of the cutting slips, the absorption efficiency of the roots to the nutrient elements in the soil is improved, the cell tissue differentiation is promoted, and the sprouting of the root system is accelerated. In addition, the effective components in the rooting solution are fixed to the root part, so that the long-term promotion effects of preserving moisture and resisting bacteria are achieved, the adaptability of the roots of the cutting slips in the soil is improved, rich nutrients can be improved, and the cutting survival rate can be notably improved. The rooting rate of the olive cutting slips soaked by the rooting solution can be up to 85%, and the seedling breeding period at a same condition is averagely shortened by 2-3 months.