The invention relates to a layered disassembling compacting experimental device for manufacturing a geomechanical model. The device comprises a bearing plate, a bottom connecting post and detachable bearing posts, wherein the bearing plate is uniformly provided with a plurality of groups of connecting posts; a plurality of layers of detachable bearing posts which are sequentially clamped are uniformly arranged on each group of connecting posts; the bearing plate has a rigid structure and is uniformly provided with a plurality of clamping grooves; the plurality of connecting posts are respectively fixed in the plurality of clamping grooves; a mortise and tenon joint structure is arranged among each layer of detachable bearing posts; and each layer of detachable bearing posts are respectively clamped and fixed by the mortise and tenon joint structure. The device has the advantages of simple structure, convenient use, good compaction effect of the model and the like, and effectively improves the technological level of manufacturing the geomechanical model.