This invention discloses a cross-platform data acquisition and conversion method of state overhaul data of an electric transmission and transformation equipment. The method comprises the following steps: S1, reading metadata of a data source from a metadatabase; loading truthful data of a source list into a temporary database; S2, reading the metadata of each conversion node, acquiring configuration information and conversion rules to generate corresponding SQL (Structured Query Language) scripts, and waiting for execution; S3, reading metadata information, acquiring a scheduling sequence after operation, and executing each conversion node according to the scheduling sequence; S4, and loading the data into a target database after all the conversions are finished. By adopting the method, the differences on data modes and interface modes of different service systems are shielded; thus, the data of the state overhaul system of the electric transmission and transformation equipment is standardized and planed, and is convenient to update and extend.