Composite quality improver, composite fresh keeping agent and application of composite quality improver or composite preservative to preparation of leaf-wrapped glutinous rice cake

The invention relates to the field of food additives, in particular to a composite quality improver, a composite fresh keeping agent, an application of the composite quality improver or the composite fresh keeping agent to preparation of a leaf-wrapped glutinous rice cake, the leaf-wrapped glutinous rice cake and a preparation method of the leaf-wrapped glutinous rice cake. The composite quality improver comprises composite phosphate, guar gum and konjac powder. The composite fresh keeping agent comprises sodium dehydroacetate, potassium sorbate and tert-butylhydroquinone. The leaf-wrapped glutinous rice cake comprises crust, stuffing, corn oil and glutinous rice cake leaves. The preparation method of the leaf-wrapped glutinous rice cake comprises the following steps: coating the corn oil on the surfaces of the glutinous rice cake leaves to obtain pretreated glutinous rice cake leaves; wrapping the stuffing with the crust to obtain an inner material; wrapping the inner material with the pretreated glutinous r