A shielding device mounted upon a printed circuit board comprises a shielding shell including a top wall, a sidewall and at least a clamping means extending downwardly therefrom respectively, which surrounds a receiving cavity defined by the shielding shell; at least a bracket removably clamped within said clamping means and fixed upon said printed circuit board; wherein the clamping means includes a first clamping part and a second clamping part respectively abutting elastically against two opposite sides of said bracket.