The invention relates to a shielding frame grounding grid for improving a peripheral power frequency electric (magnetic) field of an overhead transmission line. The shielding frame grounding grid comprises a grounding line (2) and a fixing seat (5), wherein one end of the grounding line (2) is connected with a net frame (1), a spherical hole (6) is arranged at the center of the upper end of the fixing seat (5), a connection assembly (3) is arranged in the spherical hole (6), one end of the connection assembly (3) is connected with the other end of the grounding line (2), a spherical connection end (4) is the other end of the connection assembly (3) and is matched with the spherical surface of the spherical hole (6). According to the shielding frame grounding grid disclosed by the invention, the spherical hole is arranged at the center of the upper end of the fixing seat, the spherical connection end as one end of the connection assembly is arranged in the spherical hole and is matched with the spherical surface of the spherical hole, and the grounding line is fixedly connected with the connection assembly and can select to be in any angles with the horizontal plane according to site conditions during installation, so that the reliability of grounding is ensured, the structure is simple and the installation is convenient.