Nitrogen-vacancy (NV) centers, typical luminescent point defects in diamond with excellent spin properties, have been widely used to characterize physical quantities such as magnetic field, electric field, and temperature, which not only provide scientists with a new tool for exploring and understanding physical phenomena but also open up a new path for the development of quantum sensing technology. Significant progress has been made in quantum sensing platforms based on NV centers in recent years. In medicine, this technology offers the possibility of non-destructive and non-invasive bio-imaging and diagnostics. Geologists use NV centers to probe the physical properties of the Earth's interior, NV centers provide new means for geological exploration and resource exploitation. In industrial inspection, NV centers-based sensors also provide more accurate measurements for product quality control and process optimization. With further research and technological development, NV centers-based quantum sensing platforms will play an even more important role in the future, opening the door to a deeper understanding of the natural world.