A carbon fiber earth lead is of a cable structure, and comprises a cable core, a conductive dielectric layer and a conductive sheath, wherein the cable core, the conductive dielectric layer and the conductive sheath are sequentially arranged from inside to outside, the cable core is made of carbon fibers, the conductive dielectric layer is of a screen-shaped sleeve structure formed by weaving conductive graphite yarn and wraps the outer circumference of the cable core, and the conductive sheath is of a sleeve structure made of carbon fibers and wraps the outer circumference of the conductive dielectric layer. The carbon fiber earth lead has the advantages that welding is not needed, construction is facilitated, and the earth lead can be bent at will in rock areas to fully meet requirements for the earth lead in actual work; capacitance reducing efficiency is high, corrosion resistance is achieved, contact resistance is stable, back flashover is reduced, the earth lead does not deforms or is damaged when exposed to high-power-frequency and large-impact current shocks, resistance is not influenced by seasons, and service life reaches more than 50 years; the earth lead is not degraded or lost in soil, is not influenced by rainwater wash and is stable in property. Due to the fact that the earth lead is made of a non-metal material, the earth lead is good in anti-theft effect, and the situation that the earth lead is stolen and cut, and accordingly safety of power lines is threatened does not occur.