The invention discloses a system and a method for asynchronous data synchronization on the basis of an http service aspect and log system. The method includes: intercepting an interface request of a client, and recording interface access logs; taking the access logs as a request event source, transmitting to a message queue and analyzing the access logs in the message queue; restoring in and/or out parameters after analysis, performing data mapping of new and old systems after data conversion, and writing into a new database. By recording of the interface access logs, submitting of the logs to any of data sources and adopting of processing programs for processing of data source logs, data conversion and synchronization to the new database, synchronization delay of asynchronous data can be reduced, and complexity controllability is realized.