1. A support device for a printed circuit board, comprising a plate body and a shielding cover formed integrally with the plate body, wherein, the plate body is provided with an opening and a mounting structure for mounting the printed circuit board, and the shielding cover is formed from an extension of a side wall of the opening and covers the printed circuit board; andwherein the shielding cover comprises a top plate and at least one side plate, a bottom edge of the side plate is connected to the plate body, and a top edge of the side plate is connected to the top plate.