Aviation electromagnetic detection method for railway tunnel with large buried depth change

The present invention discloses an aviation electromagnetic detection method for a railway tunnel with large buried depth change, to effectively detect geological conditions of an underground sectionof a railway line to ensure reliability of geophysical data. The method comprises following steps: arranging 11 measuring lines along a line direction; respectively detecting by adopting an aviation transient electromagnetic method and an aviation natural field electromagnetic method to obtain corresponding detection data; performing a pseudo three-dimensional inversion to the aviation transient electromagnetic detection data, and obtaining a cross-sectional graph of exploration inversion resistivity of the aviation transient electromagnetic method in a midline underground section; performinga pseudo three-dimensional inversion to the aviation natural field electromagnetic detection data, and obtaining a cross-sectional graph of exploration inversion resistivity of the aviation natural field electromagnetic method