Portable geotechnical measuring instrument and geotechnical roadbed measuring method

The invention provides a portable geotechnical measuring instrument and a geotechnical roadbed measuring method. A probe is fixedly mounted at the bottom of a full-length probe rod; the hammer seat is fixedly connected to the middle of the full-length probe rod in a sleeving mode, and a telescopic counting sensor is installed on the hammer seat and used for recording the hammering number of the drop hammer; the drop hammer sleeves the upper part of the full-length feeler lever in a manner of moving up and down, and is used for hammering the hammer seat up and down and driving the full-length feeler lever into a set depth of a roadbed sample to be detected; the full-length probe rod is provided with scale marks, and the scale marks are located between the probe and the hammer seat; the telescopic counting sensor is electrically connected to the storable calculator and transmits the hammering number of the drop hammer to the storable calculator. The device and method are simple and efficient, on-site constructo