The invention discloses an electric power line insulator contaminant automatic monitoring and alarm device, which comprises an insulator body, a solar cell, a control circuit board and a warning light. A first metal ring is arranged under an uppermost umbrella skirt of the insulator body upper part, the middle part of the insulator body is provided with a second metal ring, and a third metal ring is arranged over an undermost umbrella skirt of the insulator body lower part, the uppermost umbrella skirt outer edge of the insulator body upper part is equipped with the solar cell, the base of the insulator body is provided with the control circuit board, and the warning light is disposed below the control circuit board. The solar cell, the first metal ring, the second metal ring, the third metal ring and the warning light are respectively in electric connection with the control circuit board. The electric power line insulator contaminant automatic monitoring and alarm device provided by the invention has the characteristics of reasonable design, simple structure and easy making. When the electric power line insulator is contaminated, the device can remind people to dispose in time, has no need of electric power workers to climb poles to do inspection, saves time and labor, and has small labor intensity and high construction efficiency.