The invention belongs to the field of agricultural mechanical equipment, and relates to a multifunctional seedling stem processor, in particular to a combined design of a seedling raising mechanism, a seedling stem crushing device, a cutter shaft assembly and a crushed seedling directional scattering device. The multifunctional seedling stem processor comprises a driving belt, a suspension bracket, a universal spindle coupling, a bevel gear speed increaser, a rack, the seedling raising mechanism, a tender seedling cut-off device, the cutter shaft assembly, the crushed seedling directional scattering device and a land wheel assembly. The universal spindle coupling is connected with the input end of the bevel gear speed increaser, the bevel gear speed increaser is connected with the seedling raising mechanism and the tender seedling cut-off device through the driving belt, and the bevel gear speed increaser is connected with the cutter shaft assembly and the crushed seedling directional scattering device through the driving belt. By the adoption of the multifunctional seedling stem processor, the seedling killing function can be achieved before potatoes, sweet potatoes and the like are harvested; the labor intensity of farmers is lowered, the production efficiency is improved, and the potato damage rate is lowered; stalks and potato leaves can return to the field, so that soil fertility is kept; the seedling stem raising rate and the crushed seedling ditch-in rate are high, and potato blocks cannot be damaged in the blade crushing process.