Transformer capable of improving plate loading stability and safety

The transformer comprises a framework and magnetic cores assembled at the two ends of the framework, a plurality of baffles are arranged on the outer side wall of the framework at intervals, a winding groove used for winding a primary winding is formed between every two adjacent baffles, and a slot used for containing a secondary copper sheet is formed in each baffle. The secondary copper sheet is of an annular structure with an opening, a pin is arranged at the opening of the secondary copper sheet, the insulating shell wraps the framework and the magnetic core in a [shape, and the bottom of the [-shaped insulating shell is provided with a hollow part for the pin to penetrate through. When the transformer is mounted, the secondary copper sheet is mounted on the circuit board, the bottom of the insulating shell can increase the contact surface between the transformer and the circuit board, so that the transformer can be placed more flatly and stably, and meanwhile, the thickness of the bottom of the insulatin