The invention discloses a method and system for rapidly transferring multi-source heterogeneous power grid big data to HBase. The method includes the following steps that a power grid database is connected with an HBase data platform; each datum in the power grid database has a unique mark ID and is composed of the mark ID and data content; according to unique mark IDs, an ID mapping table is established; after a data source is selected, the ID mapping table is read and written into a memory for residence; codes in the ID mapping table are each compressed, so that data class ID row keys and data class internal ID row keys are formed; the data class ID row keys and the data class internal ID row keys are converted into a byte array; the data class ID row keys, the data class internal ID row keys and the row name qualifier of HBase are written into an HBase table in a byte form. Rapid transferring is achieved for a complex electric power data format through the method and system.