The invention belongs to the technical field of a dry-type high-frequency transformer, and particularly relates to the dry-type high-frequency transformer which can be used for improving insulation performance and reducing local discharging quantity of the transformer and is provided with an insulation structure. By additionally arranging a transition layer having a buffer effect between the winding coil and the insulation layer, favorable linkage between the winding and the insulation layer is achieved, phenomena such as gap and crack between the insulation layer and the winding in the priorart are prevented, and the local discharging level can be effectively reduced; and moreover, an insulation elastic material and an electrostatic shielding material are preferably used as transition layers, a potential risk of large local discharging quantity of the insulation layer at a high-voltage side and a low-voltage side is prevented, the insulation performance of the dry-type high-frequencytransformer is greatly improved, the service lifetime of the dry-type high-frequency transformer is greatly prolonged, and the long-term running reliability of a power electronic transformer device is improved.