Electromagnetic shielding device with conducting and heat radiating functions

The utility model relates to an electromagnetic shielding device with conducting and heat radiating functions, which is used for an electric element on a shielding circuit board and comprises a metal cover. The metal cover is provided with a top wall, a plurality of first side walls, at least one connecting part with flexibility and a plurality of second side walls corresponding to the first side walls; the second side walls are fixed on the circuit board and encircle the electronic element; the top wall is directly connected with the first side walls and connected with one of the second side walls by at least one connecting part; in each first side all and each second side wall which correspond to each other, the first side wall is provided with at least one first positioning part; the second side wall is provided with at least one second positioning part and the first positioning part is suitable for being clamped with the second positioning part; and when the first positioning parts of the first side walls