The invention discloses a preparation method of a health-care wild jujube fruit jam. According to the preparation method, Konjac glucomannan is used as a thickener and wild jujube is used as raw material. The method comprises the following steps: preparing wild jujube paste, preparing auxiliary material liquid, preparing mixed gelling liquid of Konjac glucomannan, and preparing a finished product. The preparation process is simple and preparation cost is low, and the wild jujube fruit jam has the advantages of having both nutritional value and pharmaceutical value. The fruit jam product is nutritious, crystal-clear, safe and healthy and beneficial to health and has smooth taste and mellow flavor. Besides, the fruit jam product has the effects of removing summer heat and stimulating the appetite, reducing body weight, lowering blood pressure, tranquilizing mind, nourishing heart and the like.