Potassium ions batteries(PIBs) have attracted great attention recently, due to the abundant resources, and the similar physicochemical properties of potassium to lithium and sodium. Prussian blue and its analogues(PBAs) has open-framework structure, which makes the intercalaltion/deintercalation of potassium ion with larger radius than lithium ions feasible. Actually, PBAs has been recognized as one of the most promising cathode materials for PIBs. In this paper, we introduce the progress on the researches for PBAs as cathode of PIBs systematically, including in non-aqueous batteries and aqueous batteries. Furthermore, we also analyze the problems and challenges existed for the application of PBAs materials in PIBs and prospect the future of PBAs in potassium-ion batteries. © 2021, Chemical Industry Press Co., Ltd.. All rights reserved.