The invention discloses a method for promoting safe utilization of pig farm waste through earthworm-quick growing tree species. Circulating application of pig manure, biogas slurry and composite earthworms is conducted in the quick growing forest land in different seasons, and the method comprises the following operation steps that firstly, the quick growing tree species are planted; secondly, the pig manure is applied, ring-shaped ditches are dug around the planted quick growing tree species, and the pig manure is scattered into the ditches; thirdly, biogas slurry is applied, and a pipeline for biogas slurry irrigation is laid beside the quick growing tree species, drop irrigation ports are formed in the left side and the right side, and the biogas slurry is subjected to drop scattering according to situations; and fourthly, the earthworms are applied, ring-shaped ditches are dug in an area where the pig manure is applied in the second step, the big earthworms and the small earthworms are evenly placed in the ditches, then soil returning and filling are conducted, and then the process can be completed. The anthocephalus macrophyllus planted through the method is vigorous in growth, the wood forming period is short, and economical and ecological benefits are obvious.