The invention discloses a network transformer structure which comprises an upper cover, a base, an upper module, a lower module, a circuit board and an insertion pin, wherein the upper cover and the base are connected to form a storage chamber; the upper module, the lower module and the circuit board are stored in the storage chamber; and the insertion pin penetrates the base and a supporting table successively and is welded with the circuit board. The network transformer structure disclosed by the invention has the advantages that the overall structure of the product becomes more compact and occupies smaller space because of optimization of structures of the upper cover, the base, the upper module, the lower module, the circuit board and the insertion pin; internal heat dissipation performance is enhanced; assembly efficiency is increased; and a product percent of pass is increased.