The present invention provides a high-performance water-soluble sacrificial material and a preparation method and application thereof. The
chemical formula of the water-soluble sacrificial material is A2B2Al2O7 or M4Al2O7; wherein A is one of Ca and Ba; B is Sr; and M is one of Ca, Sr, and Ba. The present invention is a water-soluble sacrificial material of the (Ca, Sr, Ba)4Al2O7
system, which has good universality in the preparation of self-supporting films; the water-soluble sacrificial layer of the present invention has high
crystallinity and a
smooth surface, providing an excellent platform for the high-quality growth of subsequent target films; the water-soluble sacrificial material of the present invention can be epitaxially grown with high quality on many substrates, thereby obtaining a self-supporting film with high
crystallinity and
high integrity.