The invention relates to the technical field of electrical power system measurement and electric energy quality, in particular to a testing method for a transformer substation capacitance type voltagetransformer model containing a reactive compensation branch. The method comprises the following steps that: S1: establishing a transformer two-port model, and obtaining a relational expression of voltage and current of two sides of the transformer; S2: adding a capacitance type voltage mutual inductor model into the transformer two-port model; S3: accessing a capacitor branch into the secondary side winding of the transformer to obtain the secondary side voltage mutual inductor model of the transformer; S4: adding the secondary side voltage mutual inductor model of the transformer into the transformer two-port model; S5: according to an electric quantity recorder, measuring data, and solving by a least square method to obtain the transformer winding parameter of the transformer two-port model; and S6: on the basis of the secondary side voltage mutual inductor model of the transformer and the transformer winding parameter of the transformer two-port model, obtaining the primary side winding voltage mutual transformer model of the transformer. The method is simple in calculation, is easy in implementation and is economic and practical.