Active differential magnetic field probe device

The invention discloses an active differential magnetic field probe device, and relates to the field of differential magnetic field probes. The upper conductor layer is etched with a first gradually-changed conical opening and a second gradually-changed conical opening; the inner conductor layer comprises a first induction ring, a second induction ring, a first linear gradient conductor, a second linear gradient conductor and a differential amplifier; the induction area of the first induction ring is overlapped with the induction area of the second induction ring; the first induction ring is connected with the differential amplifier through a first linear gradient conductor; the first induction ring is used for inducing an external magnetic field to generate a first electromagnetic signal; the second induction ring is connected with the differential amplifier through a second linear gradient conductor; the second induction ring is used for inducing an external magnetic field to generate a second electromagnet