The present disclosure provides a magnetometer body and a three-axis Induction Magnetometer (IM) using the same. The magnetometer body comprises: a magnetic core structure with an H-shaped longitudinal section, having a middle portion being an elongated rod-shaped magnetic core and two end portions being disk-shape magnetic flux concentrators; and an induction coil evenly wounded around a perimeter of the magnetic core in the magnetic core structure. In the present disclosure, disk-shape magnetic flux concentrators are fixed on two ends of the elongated magnetic core to collect magnetic flux, which is equivalent to increasing a length-diameter ratio of the magnetic core, thereby breaking through a noise limit of a conventional IM in a limited space.