A double-end-measurement-based high voltage electric cable partial discharge on-line monitoring system is disclosed and belongs to the field of electric power system detection equipment. The utility model is aimed at providing the double-end-measurement-based high voltage electric cable partial discharge on-line monitoring system which measures through two end points of a high voltage electric cable to detect high voltage electric cable partial discharge. The double-end-measurement-based high voltage electric cable partial discharge on-line monitoring system consists of a Rogowski wire coil, an operational amplification circuit, a primary program control amplification circuit, a secondary program control amplification circuit, a single end signal to differential signal circuit, an analog to digital conversion circuit, an analog to digital conversion circuit simulation power source, a +5V digital power source and a -5V digital power source. According to the double-end-measurement-based high voltage electric cable partial discharge on-line monitoring system, through difference of times when a partial discharge pulse reaches the two ends of the electric cable, and positions of partial discharge points that are discharge sources can be easily detected; thus, the double-end-measurement-based high voltage electric cable partial discharge on-line monitoring system measures at the two ends of the electric cable at the same time, signal attenuation in the electric cable can be greatly neglected, and therefore precision can be improved. Through the method, long electric cables can be detected, and the double-end-measurement-based high voltage electric cable partial discharge on-line monitoring system well conforms with on-line detection needs.