The invention discloses a data import method. The method comprises the following steps of: accessing to a version table and obtaining the current effective full data and sub-new full data according to the version table; obtaining the current newest full data and generating incremental data according to the current newest full data and the sub-new full data; importing the incremental data into the sub-new full data and carrying out version switching according to the current effective full data and the sub-new full data after the import. According to the method, a concept of importing a table of the current effective full data and a table of the sub-new full data and a thought of importing data according to alternative increment through the version table are adopted, so that the fact that a batch data table and an online service table are different tables is ensured, and the problem that certain defects exist in the process of reading and writing a same table in the prior art is solved. The invention furthermore discloses a data import device.