LLC transformer

The utility model discloses an LLC transformer which comprises at least three magnetic cores, at least three windings and a shared center pillar. Each magnetic core comprises an upper magnetic core plate, a lower magnetic core plate, a magnetic column and at least one side column, and the upper magnetic core plate and the lower magnetic core plate are the same in shape; an accommodating cavity is formed between the upper magnetic core plate and the lower magnetic core plate; the at least one side column is arranged around the accommodating cavity; the magnetic column is located in the containing cavity and connected between the upper magnetic core plate and the lower magnetic core plate, and the winding is wound on the magnetic column; the upper magnetic core plates of the at least three magnetic cores are adjacent to each other and are positioned on the same plane, and the lower magnetic core plates of the at least three magnetic cores are adjacent to each other and are positioned on another plane; and the c