The invention discloses a Eucalyptus dunnii group culture fast propagation rootage method, which comprises the following steps: (1) asepsis seedling cultivation; (2) bud subculture multiplication; (3) test-tube seedling rejuvenation; (4) inducing rootage; (5) transplanting the test-tube seedling, etc. In the invention, after the multiplication cultivation and rejuvenation cultivation, the asepsisseedling is inoculated in a first rootage culture medium and a second rootage culture medium for inducing a complete plant, thus solving the problem that the propagation coefficient of Eucalyptus dunnii group culture is low, in particular to the problem that the rootage is difficult; by utilizing the technical proposal of the invention, a large number of seedlings can be provided in a short time so as to replace the expensive imported seeds and satisfy the heavy demand of the large-scaled industrial seedling and the market.