The invention discloses a transformer, which comprises a transformer skeleton and a coil arranged on the transformer skeleton, wherein the transformer skeleton comprises a winding part and a top partand a bottom part located at two ends of the winding part; the coil is wound on the winding part and is located between the top part and the bottom part; one side of the transformer skeleton is provided with a primary platform; the coil comprises a primary coil; the primary platform is used to connect the primary coil; the primary platform is connected with the bottom part and multiple first connecting ends extend in the direction far away from the winding part; a first groove port is arranged between the adjacent first connecting ends; one side, far away from the top part, of the first connecting end is provided with a first pin; and the first groove port is used for enabling the wire starting end and the wire take-up end of the primary coil to pass through to be connected to the first pin.