The invention discloses a debugging device of an excitation capacitance-regulating transformer. The debugging device comprises a body, a plurality of connectors are fixed to the surface of the body, the surface of each connector is symmetrically provided with integrated limiting projections, a protective sleeve A and a protective sleeve B are arranged at the two sides of the connector respectively, strip-shaped grooves matching the limiting projections are formed in the surfaces of the protective sleeve A and the protective sleeve B correspondingly, the cross section of the protective sleeve Aand the cross section of the protective sleeve B are C-shaped, and the protective sleeve A and the protective sleeve B are symmetrically distributed. The protective sleeve A and the protective sleeveB are designed to replace connection between the connector and a nut at present, replacement can be carried out directly even if thread slipping, tooth decay and the like occur later, use is very convenient, the designed limiting projections can simply and effectively limit and install the protective sleeves A and B, possible rotation in connecting the sleeves with the nut can be avoided, and normal connection is not influenced.