In this research work, the structural and electrical properties of La0.8Pb0.2Fe0.75Mg0.25O3, elaborated by sol-gel process, are studied. The X-ray diffraction profile refinement shows that the structure of this perovskite is orthorhombic. DC conductivity (σDC) reveals the semi-conductor behavior and the activation energy is estimated to be 547 meV. It is also obvious that the conductivity AC follows Jonsher's universal power-law and the exponent "s" decreases with temperature increase, showing that the phenomena of conduction is related to Correlated Barrier Hopping (CBH). The plots of Nyquist demonstrate the existence of two different relaxation contributions linked to grain boundaries and grains.