PROBLEM TO BE SOLVED: To provide a pendulous landslide surface measuring instrument.SOLUTION: The pendulous landslide surface measuring instrument includes at least one outer tube 10 for being inserted into a stratum to be measured, a plurality of measuring instruments 20 arranged vertically outside the outer tube 10 to allow the outer tube 10 to respectively measure the displacement distance of each depth inside the stratum, and a guide tube 30 of an endoscope provided inside the outer tube 10 to provide a flexible image collection device 40 fittingly inside, and a water level observation tube 13 mounted inside the outer tube 10. Thus, the flexible image collection device 40 collects numerical values of displacement distances measured by the respective measuring instruments 20 and analytically determines the displacement magnitude of a landslide surface inside the stratum. Ground water flowing video collected by the flexible image collection device 40 inside the outer tube 10 is observed by a visual observation method, and the ground water flowing video is used to examine and determine a ground water level, a water vein of ground water and a stratum structure.
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