The invention discloses preserved plum flavored sour and sweet melon seeds and a preparation method thereof. The preserved plum flavored sour and sweet melon seeds are prepared from the following raw materials in parts by weight: 200-210 parts of sunflower seeds, 30-40 parts of salt, 20-30 parts of honey, 20-30 parts of preserved plum juice, 5-6 parts of broad beans, 6-7 parts of flatfish, 4-6 parts of kumquat, 4-5 parts of oil immersed dried tomatoes, 3-4 parts of chilli oil, 7-8 parts of oyster mushrooms, 4-5 parts of hotbed chives, 3-5 parts of lotus root starch, 1-2 parts of the seed of Chinese dodder, 1-2 parts of radix polygonati officinalis, 1-2 parts of turnjujube, 1-1.5 parts of flower of kudzuvine, 1-2 parts of lotus leaf, proper amount of water, and 50-60 parts of nutritional additives. The preserved plum juice is used in the invention; preserved plums are sour, sweet, fresh and delicious in taste and have the effects of invigorating stomach, astringing lung, warming spleen, stopping bleeding, eliminating phlegm, diminishing swelling, removing toxicity, promoting the secretion of saliva or body fluid, quenching thirst and treating persistent cough and dysentery; and the added traditional Chinese medicines have the effects of clearing heat, promoting urine, stopping cough, relieving restlessness, removing wine toxicity and invigorating the circulation of blood.