The invention discloses a unidirectional synchronization method of internet website data. According to unidirectional synchronization method provided in the invention, data recordings of internet website data are classified according to sizes, update frequencies, real-time requirements of user access; and various data synchronization strategies are given to each classified data. The given strategies comprise a short-period caching strategy, a real-time updating strategy, an increment updating strategy, and a background increment updating strategy. According to the invention, the latest updating time of each data recording is used as a basis for determining whether the synchronization is needed to be carried out or not, so that great adaptability is allowed. Moreover, the background increment updating strategy is especially suitable for continuous synchronization of mass data; and data flow minimization and maximization of data synchronization efficiency can be given consideration well according to the background increment updating strategy.