The invention relates to a fixed shielding net for improving a peripheral power frequency electric (magnetic) field of an overhead transmission line. The fixed shielding net comprises vertical fixing rods (1) and horizontal fixing rods (2), wherein the vertical fixing rods (1), upper horizontal fixing rods (2) and lower horizontal fixing rods (3) are respectively and equidistantly provided with through holes, the through holes are provided with connection fixing assemblies (7), the two connection fixing assemblies (7) with the equal height on each vertical fixing rod (1) are respectively and fixedly arranged on two ends of each shielding net transverse line (5), and the connection fixing assemblies (7) on each upper horizontal fixing rod (2) are fixedly arranged on one end of each shielding net longitudinal line (6). The fixed shielding net disclosed by the invention has the advantages of simple structure and convenience in installation and fixation; and the shielding net transverse lines and the shielding net longitudinal lines (6) are mutually interlaced to form an electromagnetic shielding net so that an electromagnetic shielding effect is good, the shielding effect can reach the national standard and the application range is wide.