Method for storing charging original bill by using database cluster

The invention discloses a method for storing and charging an original telephone bill by using a database cluster. Charging original data generated by a user is searched through charging node devices.The charging node device in a core network comprises the following network elements: an MME, an SGW, a PGW, an SGSN and a GGSN, wherein each charging node device can respectively collect charging information of a user; when user terminal equipment accesses a mobile communication core network, the user terminal equipment provides an international mobile subscriber identification number of a terminal, an integrated service digital network number of a mobile subscriber, an international mobile equipment identification number and information of a wireless access technology type, and the charging node devices store the information as a first part of original charging data. The method has the advantages that the database cluster is used as an independent storage system to work, the hardware capacity of the charging node