The invention relates to a routing lookup algorithm, and in particular relates to an unlocked flow table routing lookup algorithm adopting a multi-core processor high-speed parallel execution manner. In the multi-core processor parallel execution environment, a flow table design structure having the number corresponding to the core number is adopted, the manner of combining control planes with data planes in multiple cores is used, and a delete operation for entries in the flow table can be divided into two relatively independent stages, namely FLOW-INVALID and FLOW-DELETE stages, so that the multiple cores can read and write one flow table at the same time without relying on the control of a resource lock. The unlocked flow table routing lookup algorithm adopting the multi-core processor high-speed parallel execution manner solves the data processing bottleneck problem caused by the existing flow table design method during the multi-core processor parallel execution process, realizes safety and rapidness of data transmission during the multi-core processor parallel execution process, and improves the high-capacity system routing lookup speed and the parallel routing lookup performance.