Diameter-adjustable rhizosphere soil sampling brush

The utility model provides a rhizosphere soil sampling brush with adjustable diameter, which belongs to the technical field of sampling technology, the rhizosphere soil sampling brush with adjustable diameter comprises a sampling tube, a brush structure, an adjusting structure and a limiting structure, the brush structure is arranged in the sampling tube, the brush structure comprises hard brush hair and soft brush hair, the adjusting structure is arranged in the sampling tube, and the limiting structure is arranged in the sampling tube. The hard bristles are arranged on the inner wall of the left end of the sampling pipe and fixedly connected with the inner wall of the left end of the sampling pipe, the soft bristles are arranged on the inner wall of the center of the sampling pipe and fixedly connected with the inner wall of the center of the sampling pipe, the hard bristles and the soft bristles are used for sampling, and the sampling pipe comprises a left side pipeline and a right side pipeline. The left