Primary and secondary oppositely-inserted transformer

The embodiment of the invention discloses a primary and secondary oppositely-inserted transformer which comprises a framework wound with varnished wires, and a magnetic core inserted in the framework. The framework comprises a primary framework body and a secondary framework body, and the primary framework body and the secondary framework body are assembled and connected in an oppositely-inserted mode. The primary framework body and the secondary framework body are respectively of a hollow structure, and the primary framework body is inserted in the hollow structure of the secondary framework body. The magnetic core is in an E shape, and the middle portion of the E-shaped magnetic core is inserted into the hollow structure of the primary framework body and the hollow structure of the secondary framework body. The primary and secondary oppositely-inserted transformer has the advantages that consumable materials are fewer, cost is reduced, production process is simple, labor is reduced and production efficiency