The invention discloses a preparation method for a composite product of ganoderma lucidum polysaccharides and egg yolk antibody. The prepared ganoderma lucidum polysaccharides liquid and egg yolk antibody are composited according to the ratio of 3:1 to obtain the composite product of ganoderma lucidum polysaccharides and egg yolk antibody. By adopting a modern egg yolk antibody extraction technique suitable for mass production and an optimized ganoderma lucidum polysaccharides extraction technology, the effect of Newcastle disease egg yolk antibody is combined with that of ganoderma lucidum polysaccharides, so the composite product plays a therapeutic action on the Newcastle disease, and moreover, has a good prevention effect. The composite process is simple and mature, the raw materials are easy to obtain and the cost is low; the antibody activity is ensured, meanwhile the action effects are enhanced after the composition of ganoderma lucidum polysaccharides and egg yolk antibody; the composite product is safe to take, has no side effects and greater market popularization value.