The invention discloses an intelligent insulator for an electric rail traffic traction power supply system. The intelligent insulator comprises an insulator body, one end of the insulator body is provided with a lower accessory, the inner wall of the lower accessory is provided with a pressure sensor, an outer protective sleeve is arranged between a skirt of the insulator body and the lower accessory, a leakage current collection ring is arranged on the outer protective sleeve in a sleeved mode, and the leakage current collection ring and the pressure sensor are respectively connected with a lead. The intelligent insulator has the advantages that online quality monitoring and visualization quality report are achieved, quality accidents, caused by insulation devices, of the electric traction power supply system are warned in advance, intelligentization of the insulation devices for the electric rail traffic traction power supply system is achieved, and safety and stability of the electric rail traffic traction power supply system are guaranteed.