Ammonia (NH3) is a promising energy carrier to store and transport renewable energy due to its high energy density (18.6 MJ kg-1, containing 17.6 wt% H2) and mature storage and transportation. Ammonia-fuelled solid oxide fuel cells (NH3-SOFC) show multiple clean energy applications due to their high efficiency, near-zero CO2 emissions, and flexible integration. This work delineates the current status and prospects of integrated NH3-SOFC technology towards a green ammonia economy by investigating its operating principle, system integration, and cost-competitiveness. Technoeconomic analysis results suggest that the levelized cost of electricity (LCOE) for NH3-SOFC is approximately 0.24 $ kWh-1. In addition, ammonia has demonstrated a high potential as a green shipping fuel because of its carbon-free and low flammability characteristics, while necessitating industry standards and large-scale application scenarios. It has also been indentified that the large-scale application of NH3-SOFC largely depends on the reduction in capital cost, electrode materials improvement and volumetric power density increase.