The invention provides an iron core coil type current transformer with high detection precision and an electric leakage detection device. The high-precision iron core coil type current transformer comprises a first iron core group and a second iron core group, wherein both the first iron core group and the second iron core group include a first iron core and a second iron core which form a circular ring after being folded, both the first iron core and the second iron core include a plurality of long iron core sheets and short iron core sheets which are arranged at intervals, the folding part of the short iron core sheet of the first iron core and the long iron core sheet of the second iron core is provided with a first air gap, the folding part of the long iron core sheet of the first ironcore and the short iron core sheet of the second iron core is provided with a second air gap, a connecting line of the first air gap at one end and the second air gap at the other end passes throughthe center of the iron core group, the first air gap of the first iron core group is perpendicular to the second air gap of the second iron core group, and the second air gap of the first iron core group is perpendicular to the first air gap of the second iron core group. The electric leakage detection device comprises an electric leakage detection terminal provided with the high-precision iron core coil type current transformer and a receiving terminal.