The utility model discloses a sampling device for geological prospecting, which comprises a handrail, a connecting pipe is screwed at the bottom end of the handrail, a sampling head is screwed on thelower surface of the connecting pipe, and a sampling barrel is assembled on the outer surface of the sampling head. The utility model provides a geological prospecting sampling device with a handrail,a connecting pipe, a sampling head and a sampling barrel. Connecting pipe comprising a housing, a stud is fixedly mounted at the top end of the shell; the center of the stud is sleeved with a lockingrod; in use, a plurality of connecting pipes are screwed together; in the screw joint process, the screw joint is uniform; the top end of the lock rod is clamped in a guide groove in the upper surface of the first stud; the positioning effect of the baffle block and the baffle sheet is utilized; when the Luoyang shovel type soil sampling device is used, the first stud and the connecting pipe located at the lower end are locked, the connecting pipe is prevented from rotating, the problem that in the using process of an existing Luoyang shovel type soil sampling device, when the Luoyang shoveltype soil sampling device rotates forwards or reversely, the connecting pipe is loosened and disengaged is effectively solved, and convenience in the using process of the Luoyang shovel type soil sampling device is improved.