Transformer

The invention discloses a transformer. The transformer comprises a bottom plate, a first magnetic core, a second magnetic core, a third magnetic core, a first winding, a second winding, a plurality of inserting plates, a first framework and a second framework, wherein the first magnetic core comprises a first core column, the second magnetic core comprises a second core column, and the third magnetic core comprises a third core column; the first framework comprises a first peripheral wall, a first supporting part and a second supporting part, wherein the first supporting part and the second supporting part are arranged on the bottom plate; the first peripheral wall is encircled to form a first accommodating space for accommodating the first core column and the second core column; the first peripheral wall is provided with a plurality of slots arranged at intervals; the inserting plates are inserted into the corresponding inserting grooves so that the first peripheral wall can be divided into a plurality of se