The concept of multi-principal elements has opened up prospects for the development of new high-entropy ceramics (HECs) suitable for extreme application environments such as advanced turbine engines, nuclear reactors, and hypersonic flight vehicles. High-entropy metal borides (HEBs), as a new type of HECs, have high hardness, high-temperature strength, low thermal conductivity, and radiation resistance, making them suitable for use in the aerospace field. This study provides a detailed review of the preparation technologies of HEBs powders and ceramics, evaluating the advantages and disadvantages of different preparation methods. By reviewing the latest research progress in the field of super-hard ceramics and ultra-high temperature ceramics at home and abroad, the advanced position of HEBs in materials science is revealed. Future research directions of HEBs, such as advanced powder preparation technology, efficient ceramic sintering technology, machine learning, and computer simulation are discussed. This review provides scientific basis and technical support for promoting preparation, performance improvement and wide application of HEBs.