The utility model discloses an intelligent error verification system of 220KV voltage transformer, surveyed voltage transformer, voltage load box and multiunit and closed the balancing reactor including intelligent voltage adjustment control box, voltage stepping up test transformer, 220kV standard voltage transformer, quilt, the intelligent voltage adjustment control box includes the power module and the transformer calibrator of integrated design, 220kV standard voltage transformer's once side links to each other with the once side by side voltage transformer, and secondary side between them links to each other with transformer calibrator, the secondary side of being surveyed voltage transformer still links to each other with the voltage load box, it is continuous with the compensating winding of voltage stepping up test transformer that the multiunit closes the balancing reactor, and the multiunit closes the balancing reactor and includes a plurality of parallelly connected reactors. The utility model discloses utilize intelligence to transfer the secondary reactive compensation technique of sense and the automatic voltage regulation control technique that has the transformer calibrator function, realize carrying out the examination of full -automatic on -the -spot error to 220kV and following electric pressure voltage transformer to solve the problem that the on -site proving was stepped up and is not realized well.