The invention discloses a method for optimizing data forwarding in a nested mobile network. In the method, a nested mobile network address conversion table is introduced and comprises the three fields of a destination mobile router home address, a next-level mobile router address and a life cycle. As the mobile routers of each level establish the nested mobile network address conversion table layer by layer and execute the address replacement and forwarding of data packets layer by layer, the upper-level mobile routers can relatively better solve the problem of the frequent tunnel encapsulation and de-encapsulation of the nested mobile network in the data forwarding without knowing network topological information maintained by the next-level mobile routers thereof to further optimize the way of forwarding the data packets in the nested mobile network and simultaneously protect the privacy of the internal topological information of lower-level nested mobile networks. Moreover, the defect that stub networks discard the data packets of the lower-level mobile networks is overcome. The method has the advantages of simple operation steps, easy implementation and vast popularization and application prospect.