The invention discloses an automatic topology realisation method based on topological bucket algorithm, belongs to the field of computer network management, and is particularly suitable for network topology management of an Ethernet exchanger. The invention solves the technical problem of quick formation of wide area automatic topology. The invention comprises the steps of optionally selecting a network apparatus in a topological seed bucket as a seed net element, sending a message for inquiring apparatus adjacency relation to the seed net element, obtaining the apparatus adjacency relation, adding the inquired adjacent apparatus in a temporary topological queue, orderly constructing net elements and apparatus icons on a topological plane, and establishing a topological relation; comparing the apparatuses in the temporary topological queue with the apparatuses in the topological bucket and the topological seed bucket, then orderly taking out the adjacent apparatuses as seed net elements from the to-be-topological queue, continuously searching and circulating, and accomplishing topology until the temporary topological queue, the to-be-topological queue and the topological seed bucket are blank. The technical proposal of the invention has the advantages of high efficiency, high flexibility and high accuracy, and the topology is relatively intuitive.