Transformer capable of improving primary and secondary coupling degree

The transformer capable of improving the primary and secondary coupling degree comprises a transformer framework and a magnetic core, a plurality of baffles are arranged on the transformer framework from top to bottom in a surrounding mode, a winding groove used for winding a primary winding is formed between every two adjacent baffles, and a slot used for inserting a secondary copper sheet is formed in each baffle. Each secondary copper sheet is of an annular structure with an opening, a bending pin and a bearing pin are arranged at the position of the opening of each secondary copper sheet, the secondary copper sheets in every two adjacent inserting grooves are in butt joint through the bending pins and the bearing pins respectively, and in the assembling process, after the primary winding is wound around the winding groove, the secondary copper sheets can be directly and correspondingly inserted into the inserting grooves of the baffles. According to the transformer, auxiliary fixation by a jig is not need