The invention discloses a winding deformation judgment method based on frequency response analysis (FRA). The method comprises the steps that a method is established according to a transformer windingequivalent circuit model, the influence law of a winding physical form on winding RLC and other distribution parameters is analyzed, a winding system parameter identification technology is determined, influence factors of winding circuit parameters are summarized, the relation between winding system parameter changes and deformation factors is obtained, a sweep frequency impedance curve is used for judgment, and a short-circuit reactance method and a frequency response method are combined and can be called a "sweep frequency impedance method". The sweep frequency impedance method is a novel transformer winding deformation test method, well combines the characteristics of the two test methods, makes a big breakthrough in test principle and has the advantages that test equipment is simple and easy to carry, the sensitivity is high, and the criterion is clear. By use of the method, a transformer sweep frequency impedance curve and a short-circuit impedance value can be obtained just through one test, and errors caused by multiple times of wiring are effectively reduced.