NOVELTY - Making nejayote using corn stalks and sweet potato, comprises adding sweet potato in a closed container, then placing the container into a 5UVA sedimentation tanks to induce accelerated yellow pulp with water stratification, identifying yellow slurry on an upper layer, detecting the voltage value on the upper layer to be 2.6-3 V by a photoelectric sensor, detecting the voltage value on a 5UVA5b lower layer 4.5-5 V, adding corn straw powder, Sorghum straw powder, peanut straw powder and sweet potato powder, anaerobically fermenting, granulating, and drying.    USE - The method is useful for making nejayote using corn stalks and sweet potato (claimed).    ADVANTAGE - The method economically makes the nejayote using corn stalks and sweet potato in an eco-friendly manner.    DETAILED DESCRIPTION - Making nejayote using corn stalks and sweet potato, comprises adding sweet potato in a closed container at a pressure of 0.23 Mpa, then placing the container into a 5UVA sedimentation tanks to induce accelerated yellow pulp with water stratification, identifying yellow slurry on an 5UVA5a upper layer, detecting the voltage value on the upper layer to be 2.6-3 V by a photoelectric sensor, detecting the voltage value on a 5UVA5b lower layer 4.5-5 V, adding corn straw powder, Sorghum straw powder, peanut straw powder and sweet potato powder, where mass ratio of the corn straw powder and sweet potato powder is 80-50:20-50%, then performing anaerobic fermentation, granulating, drying to obtain auxiliary feed material, adding biological soil moisture preservation fertilizer products in a 5UVB sedimentation tanks at a pressure of 0.23 Mpa, identifying yellow slurry on an 5UVB5a upper layer, detecting the voltage value on the upper layer to be 2.5 to 2.8 V by a photoelectric sensor, detecting the voltage value on a 5UVB5b lower layer 4.5-5 V, again adding corn straw powder, Sorghum straw powder, peanut straw powder and sweet potato powder, anaerobically fermenting, granulating and drying to spherical granular feed material with a pellet hardness of 1.8-3.2 kg and a pellet diameter of 0.5, then passing obtained product into A 5UVD sedimentation tanks, adding water purifying agent, polyacrylamide, polyaluminum ferric chloride, polymeric ferric sulfate and polyaluminum chloride, adjusting pH value, adding lime, sodium hydroxide and ammonium hydroxide and mixing, identifying yellow slurry on an 5UVA5a upper layer, detecting the voltage value on the upper layer to be 0.8 to 1.2 V by a photoelectric sensor, adjusting the pH value to 7.7-8.5, detecting the voltage value on a 5UVA5b lower layer 4.5-5 V, adding corn straw powder and bentonite powder, then performing anaerobic fermentation, granulating, drying to obtain spherical granular material, again adding water purifying agent, polyacrylamide, polyaluminum ferric chloride, polymeric ferric sulfate and polyaluminum chloride, and adjusting PH value, and detecting the voltage value on the upper layer to be 0.7-1 V, and a lower layer to be 7.4-7.6.