The invention provides a deep abnormal body boundary recognition and step-by-step enhancement method and system, a medium and equipment. According to magnetic field three-component data and magnetic gradient tensor data of an object to be recognized, reverse tangent operation is performed to obtain a preliminary recognition result of a deep abnormal body boundary; by utilizing magnetic gradient tensor data components and a boundary recognition method improved by the reverse tangent operation, the deformation of the deep abnormal body boundary is inhibited; and by utilizing an idea of gamma conversion in image processing, parameter adjustable image enhancement is performed according to enhancement shadow area contrast or high-brightness area contrast of different value selectivity, a targetbody boundary is further highlighted, and a final recognition result is obtained.