Geotechnical survey device and survey method

The invention relates to a rock-soil exploration device. The rock-soil exploration device comprises a hollow drill rod on the outermost layer and a detection rod arranged in the drill rod in a sleevedmode. The detection rod is a rod body formed by alternately connecting a plurality of induction sections for detecting a magnetic conductive ore layer and a plurality of connecting sections made of conductors; the induction section structurally comprises a piezoelectric ceramic core body located in the center and a magnetostriction ring body tightly hooping the piezoelectric ceramic rod body; leads are respectively led out from the piezoelectric ceramic core bodies and are connected to a current receiver positioned at the upper end of the feeler lever; the current generated by each piezoelectric ceramic core body is subjected to information processing through a processor; according to the device and the method, mineral distribution in rock soil is automatically pre-judged by utilizing thedifference of magnetic co