The invention discloses an electric power line suspension device, and relates to the technical field of electric transmission line maintenance tools. The electric power line suspension device comprises pulleys, fixed poles are mounted on the pulleys respectively, U-shaped poles are arranged at ends of the fixed poles, first connection poles are arranged at one bottom ends of the U-shaped poles, first hooks are arranged on one sides, away from the pulleys, of the first connection poles, a back support pole is arranged between the first connection poles, a shell is arranged below the back support pole, second connection poles are arranged at the other bottom ends of the U-shaped poles, adjusting poles are arranged on the second connection poles, adjusting bolts are arranged on the adjusting poles, third connection poles are arranged at bottoms of the adjusting poles, a first connection plate and a second connection plate are arranged inside the shell, first gaps are reserved in a sidewall of the shell, stop plates are arranged at the positions of the gaps, a lifting device is arranged in a second cavity, a lifting frame is arranged on the lifting device, and second gaps are reserved in a top wall of the shell. The electric power line suspension device has the advantages that workload of workers can be alleviated, and the electric power line suspension device can be fixed effectively.