As a zero-carbon fuel and a hydrogen carrier, ammonia has great storage and transportation advantages. Solid oxide fuel cell(SOFC) is a clean and efficient power generation device, which has promising application prospects in distributed power generation, combined heat and power generation, energy storage and peaking, etc. Ammonia can be used directly as SOFCs anode fuel for efficient, clean, low-cost power generation. The working principles of proton-conducting and oxygen ion-conducting ammonia SOFCs, the electrolyte and electrode materials, and the decomposition process of ammonia at the anode were introduced firstly. Based on this, the experimental research status of ammonia SOFCs was summarized. Using the maximum power density of single cell as evaluation indicator, the performance of two types ammonia SOFCs with different electrolytes and electrode materials, electrolyte thicknesses, and temperatures were reviewed. And the reasons for the difference in cell performance were analyzed. After that, the current challenges of ammonia SOFCs were introduced, and eventually the future research direction of ammonia SOFCs and the application of combined heat and power system were prospected.