The utility model relates to a multi-functional soil processing device. The multi-functional soil processing device comprises a support and a grinding hammer, wherein an aggregate stirring part, a grinding part and a material receiving and screening part are sequentially fixedly arranged on the support from top to bottom; the grinding hammer comprises a grinding rod and a hammer body arranged at the bottom of the grinding rod, and the shape of the outer surface of the hammer body is matched with the shape of the bottom of the grinding part; the grinding rod is arranged at the aggregate stirring part and the grinding part in a penetrating manner, and the hammer body is contained in the grinding part; and a spiral stirring paddle is arranged on the grinding rod. The multi-functional soil processing device provided by the utility model has the advantages that the aggregate stirring part, the grinding part and the material receiving and screening part are smartly sequentially arranged in design, to-be-processed soil is put into the aggregate stirring part, and the soil is stirred to break down a soil block in the soil and remove other things, then falls into a space between the hammer body and the grinding part to be ground and smashed and finally falls into the material relieving and screening part to be further accurately screened according to particle size; and combination of multiple processing flows on the soil is realized, so that a soil sample can be more accurately processed, energy is saved and cleanness and environmental protection are realized.