Abstract: A device and method for testing fracture toughness of a solid-ice interface on a surface of coating material in a large-scale freezing status are provided. The method uses the principle of single-cantilever beam loading, and utilizes the bending stress of a metal substrate to induce the generation and extension of micro-cracks at the solid-ice interface, which are intended to observe the fracture behavior at the interface between the surface of a coating material with metal as a substrate and the ice layer, so as to obtain the fracture toughness at the interface between the ice layer and the surface of the substrate.