The invention relates to a Rogowski coil and an electronic current transformer applying the rogowski coil. The Rogowski coil comprises a coil substrate formed by a framework and a lead winding the framework, an insulating layer wrapping the surface of the coil substrate and a metal shielding layer wrapping the periphery of the insulating layer, an annular notch coaxial with the coil substrate is arranged on one side, close to the center of the coil substrate, on the metal shielding layer, the annular notch is used for a magnetic field generated on a primary conductor to pass to enter the coil substrate, and the metal shielding layer wraps the surface of the insulating layer. The annular notch is arranged to enable the magnetic field generated on the primary conductor to pass to enter the coil substrate, so that the coil substrate can induce the magnetic field generated on the primary conductor; meanwhile, electromagnetic interference of other exterior equipment is shielded through the metal shielding layer, and accuracy in measurement result is improved.