The invention discloses a database unification platform for electric power big data and a reading method thereof. The method comprises the steps of starting; Verification: the database platform verifies the user identity; Transmitting: receiving a data access request from a user; making Cross-library judgments: when the data access related to the service demand is a cross-library data request, enabling a data access component to forward the service demand to a data hybrid processing engine; Business planning: enabling a data hybrid processing engine to collect, store and process different types of cross-library data, and generating business data; And forming the data into an organization form of data required by the user, returning the data to a foreground display page to be displayed intoa table, and providing the table for the user in combination with a visualization technology. The platform has the advantages of being high in speed, flexible in configuration, capable of crossing databases and the like, multiple databases and data types can be accessed simultaneously in a barrier-free mode, meanwhile, guarantees are provided for rapid development of upper-layer business applications of the unified platform of the power databases, and the design and implementation of the upper-layer applications do not need to consider the difference of the types of bottom-layer databases.