The invention relates to a loess collapsibility sensitivity evaluation method based on an in-situ test technology. The loess collapsibility sensitivity evaluation method based on the in-situ test technology comprises the steps of excavating a water immersion test pit; making three intersecting straight lines on a pit bottom; setting multiple gage points on each straight line, wherein the distancebetween each two adjacent gage points is not smaller than 1m, the embedding hole depths of two gage points in the same gage point group are the same, the shallowest embedding hole depth on the secondstraight line is larger than the deepest embedding hole depth on the first straight line, and the shallowest embedding hole depth on the third straight line is larger than the deepest embedding hole depth on the second straight line; embedding a test requirements document (TRD) soil moisture meter probe and a settlement plate into embedded holes of the same straight line in a spaced manner, arranging range poles in the embedded holes, and installing observation rulers on the range poles; arranging two fixed observation points outside the test pit; measuring initial elevations of all settlementplates, and measuring the initial moisture content of each depth part in the test pit; immersing water in the test pit; and obtaining the soil water-immersion time and the initial soil collapsibilitytime, wherein a difference between the soil water-immersion time and the initial soil collapsibility time is an index for quantitatively evaluating loess collapsibility sensitivity.