The utility model discloses an SF6 pressure gauge shielding device, which comprises a shielding piece, the shielding piece comprises a top surface and four walls enclosed by three side surfaces and afront surface, and the top surface seals the tops of the four walls; the middle of the top face arches upwards to form a cylindrical protruding part, one side face of the four walls extends towards the middle of the top face to form a horizontal face, the side, close to the horizontal face, of the protruding part is turned over to form a vertical face, and the vertical face is connected with the horizontal face and forms a groove with the horizontal face and the four walls. The shielding piece is arranged around the pressure gauge or the pressure gauge rain cover; the front face is made of transparent materials, and a gap is reserved in the upper portion, close to the protruding portion, of the front face. The shielding piece is detachably provided with a shielding cover used for shieldingthe front face. The device is simple in structure, convenient to install and low in cost, can be stably installed on the pressure gauge, shields direct sunlight, weakens the effect of temperature compensation, reduces the temperature of the pressure gauge, and is more convenient and accurate in reading.