The invention discloses a placement device for a reservoir engineering geological exploration sampler. The placement device for the reservoir engineering geological exploration sampler comprises a placement shell, a top cover, a handle, a fastening bolt, a spring, clamping plates, a rubber pad, a geological exploration sampler body, a moving plate, a bottom plate, a limiting groove, a first supporting frame, a sliding groove, a threaded rod, a lock nut, a limiting plate, a connecting block, a sliding block, a first supporting plate, a second supporting plate, a second supporting frame, a baseand a hydraulic cylinder. The placement device for the reservoir engineering geological exploration sampler has a simple structure and novel design, is convenient for placing and clamping the geological exploration sampler body, ensures the stability of the geological exploration sampler body placement, is convenient for the stable transportation of the geological exploration sampler body, and reduces collisions. When the placement device is used, the placement device is convenient for a worker to adjust the distance between the bases on the opposite sides of the placement shell according to the diameter size of an exploration pipe body, reduces the labor intensity of the worker, improves the efficiency, and is convenient to use.