Flat coil type high-power transformer

The invention discloses a flat coil type high-power transformer which comprises a primary winding, a secondary winding and a transformer magnetic core assembly, one of the primary winding and the secondary winding comprises more than two inner ring coils which are arranged in an up-and-down laminated mode, and the other one of the primary winding and the secondary winding comprises more than two outer ring coils which are arranged in an up-and-down laminated mode; each inner-ring coil and the corresponding outer-ring coil are arranged on the same layer, the outer-ring coils are provided with inner-ring cavities, and the inner-ring coils are arranged in the inner-ring cavities of the outer-ring coils and are concentric with the outer-ring coils. Therefore, by adopting the internal and external combined design of the vertically-wound flat coil, the window area of the magnetic core can be effectively utilized, the turn ratio of the flat coil is improved, the product height is reduced, the product volume is reduc