The invention relates to a shielding device applied to a high voltage direct current converter valve. The shielding device comprises a module shielding plate, a top shielding cover and a bottom shielding cover, and is characterized in that: the module shielding plate comprises angle shielding plates (1) and short shielding plates (2) which are positioned on different valve layers of the converter valve and arranged at the periphery of a valve module and encircle the three surfaces of the valve module of the converter valve; two angle shielding plates (1) are arranged at the periphery of the valve module along the two ends of the width direction respectively; and three short shielding plates (2) are arranged at the periphery of the valve module along the length direction of the valve module in turn. The device has good advantages of optimizing electrical parameters of the converter valve and improving the voltage class of the converter valve; meanwhile, the device has better voltage class adaptability, can be applied to different voltage classes, and even can be expansively applied to the voltage class of extra-high voltage over +/-800kV.