The invention relates to the field of communication and specifically relates to an optical fiber network balancing routing method based on link dynamic loads. The method comprises the steps of S1, dividing a network into routing domains according to business demands, recording inter-domain nodes and links of different routing domains, setting identifiers and recording inter-domain link weights of the routing domains; S2, carrying out routing computation on the routing domains and updating a link state database; S3, dividing complete business flow into different intra-domain segments and marking service quality demands; S4, determining a layer of a power business initial node; S5, updating routing table information among different routing domains and carrying out segmental routing on different types of business; S6, expanding the segments of the business follow in the corresponding routing domains; S7, determining an entrance node address of a business termination routing domain, thereby finishing layered routing; and S8, combining the business routing segments in various routing domains, thereby forming a complete explicit routing.