The invention discloses a voltage transformer verification platform of a GIS and a boost compensation method. The voltage transformer verification platform of the GIS comprises an intelligent power source, a test transformer, a multi-combination stepping adjustable resonant reactor, a standard voltage transformer, a voltage transformer load box, a current sampler and a remote control box, wherein the intelligent power source is provided with an error measurement unit. The voltage transformer verification platform is advantaged in that through accurately measuring primary loop parameters, a to-be-compensated inductance value is calculated, accurate compensation is carried out, employing a series or parallel mode of different specification reactors for multiple times to realize different compensation inductance values is not needed, and high verification efficiency is realized; the platform is provided with a hanger, hoisting transport is convenient, the multi-combination stepping adjustable resonant reactor used for compensating the induction value is fixedly mounted on the platform, establishment during verification is not needed, and hidden safety trouble caused by drop can be eliminated.