The utility model discloses a transformer comprising a box body having a bottom surface; a core and a winding are arranged in the box body; periphery walls of the box body are respectively provided with a gilled radiator; a lower position, relative to the gilled radiator, of the box body is connected with a mounting support being a right angleboard; the angleboard comprises a first fixing plate and a second fixing plate; the first fixing plate is provided with a slide block; the box body is provided with a slide track matched with the slide block; the first fixing plate is connected with the box body through cooperated the slide track and the slide block; the second fixing plate and the bottom surface of the box body are on a same horizontal surface; the first and second fixing plates are respectively provided with thread holes; the box body is provided with connecting holes having bore diameter consistent with that of the thread holes; the transformer structure is better in firm property after the box body is installed, the mounting support can more stably support the box body, and safety is high.