The invention discloses a nutrient fertilizer for culturing a selenium-and-germanium-rich multi-element watermelon, which belongs to the technical field of preparation and production of nutrient fertilizers for water melons as a green agricultural product in farmer benefiting technology. The nutrient fertilizer is prepared from compound tract element nutrient base fertilizer, selenium-and-germanium-rich steel slag, mineral slag, bagasse and soybean cake powder natural elements, natural mineral elements, a natural green agricultural straw organic element, and industrial-and-agricultural waste residue, poultry-and-livestock manure and natural soil fertility enhancer nutrient base fertilizer. The objective of the invention is to comprehensively and effectively increase the content of nutrient elements in watermelon juice, achieve supplementation, regulation and antagonism and nutrient element balance in the human body through the homology of medicine and food, enhance immunity, increase disease resistance, strongly resist oxidation, remove free radicals, strongly absorb toxins, discharge waste, increase oxygen, remove heavy metals and various toxins in the body and release trace element anions good for the health of the human body, and the invention is a new technological measures for building the body, improving the constitution of citizens, increasing incomes of farmers and benefiting people.