<p>The aim of the study is to investigate the effect of ice-like water lubricant on the friction damage properties of the coarse surface of multicrystalline cubic silicon carbide nanofilms. A molecular dynamics-based approach is used to simulate the nano-grinding process of ice-like aqueous lubricants on rough surfaces of multicrystalline cubic silicon carbide nanofilms. A rough surface model of multicrystalline cubic silicon carbide is established based on the Voronoi approach, with annealing pre-treatment to compact the atomic arrangement. The water molecule layer and diamond model are constructed based on the molecular dynamics approach. Three models for nano-grinding machining experiments are coupled. The experimental anisotropic cutting behavior of multicrystalline cubic silicon carbide is analyzed. Examples include size effects, crack sprouting and propagation, and mechanisms of grain boundary step generation. The results show that the wear is mainly caused by stress concentration and crack extension at grain boundaries. The anisotropy of the material leads to a decrease in local densification and cracks preferentially sprout at and extend along the grain boundaries. At the same time, shear forces are transmitted in a stepwise manner within the crystal, exacerbating the damage in the grain boundary region. Ice-like water lubrication effectively mitigates friction damage by reducing the number of dislocations, lowering the stress concentration, and inhibiting the crack extension. The study elucidates the mechanism underlying grain boundary crack initiation and propagation, as well as the critical role played by ice-like lubricants in mitigating surface damage. It offers a theoretical foundation for optimizing the machining process.</p>