The utility model discloses a secondary-connection component for transformer calibration. The secondary-connection assembly comprises a secondary electric cylinder, a secondary positioning guide plate and secondary pressing pin assemblies and further comprises a secondary cross beam. At least two secondary pressing pin assemblies are connected with a telescopic end of the secondary electric cylinder through the secondary cross beam. A cylinder body part of the secondary electric cylinder is installed on the secondary positioning guide plate. The technical scheme that the secondary cross beam is added between the secondary electric cylinder and the secondary pressing pin assemblies is adopted, so that the objective that multiple secondary pressing pin assemblies are installed on the same electric cylinder is achieved, the cost is reduced, and the secondary-connection component is compact in structure and small in size. The secondary-connection component is suitable for calibration of transformers.