The invention discloses a data acquisition method for an external link of a database. The method comprises the following steps that S1, a local database obtains remote data through an external link, an ROWID in the extracted remote data serves as an aggregation main key to create a local temporary table, the remote data is stored in the local temporary table with a data table as a unit, and the maximum transaction ID number of the data table is stored; S2, when the data table needs to be accessed again, records of which the data table is greater than the maximum transaction ID number are filtered out from an external database to obtain incremental data of the data table; And S3, merging the incremental data into the local temporary table, and updating the maximum transaction ID number. According to the data acquisition method for the external link of the database provided by the invention, repeated acquisition of the same data from the external database is avoided, time waste is avoided, and network bandwidth consumption is avoided.