Hidden volcanic rock thickness calculation method and device and readable storage medium

The invention discloses a method for calculating the thickness of a hidden volcanic rock. The method comprises the following steps: acquiring magnetic anomaly data and magnetic susceptibility data of a known volcanic rock in a target area; the magnetic anomaly data comprises amplitude and form of magnetic anomaly caused by volcanic rock; determining the range of volcanic rocks to be measured in the target area according to the magnetic anomaly data; acquiring a magnetic anomaly region caused by the volcanic rock to be measured from the aviation magnetization pole data, and dividing the magnetic anomaly region into a plurality of subregions; establishing a depth weighted focusing inversion objective function based on the subregions; obtaining magnetic susceptibility three-dimensional distribution of each sub-region based on the depth weighted focusing inversion objective function; and calculating the volcanic rock thickness of the subarea based on the three-dimensional distribution of the magnetic susceptibili