The invention discloses a lightweight concurrent migration method of a database, and relates to the technical field of data migration. Aiming at problems and existing defects in the existing database migration process, the technical scheme adopted by the invention comprises the following steps: loading configurations of an original database and a target database, loading a corresponding grammar dialect according to the type of the target database, and performing grammar verification on the configurations; generating a table, a storage process, a function, a view, an index and others of the target database based on the loaded configuration; according to resources of an operating system, dynamically controlling the number of started threads, and carrying out concurrent migration on data of an original database through the started threads; and after migration is completed, performing default verification and configuration verification on the original database and the target database. Third-party middleware is not adopted, the method has the advantages of being efficient in operation, low in use cost, easy to expand, configurable and capable of achieving elastic expansion and contraction, and lightweight fast migration of data can be achieved.