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Nanoarmor strengthens the structure and function of single cells by coating and encapsulating nanomaterials on single cells. It has tremendous potential for environmental, energy, and medical applications.Nanoarmor can isolate cells from their environment, endowing them with catalytic functions and photoelectric properties, and protecting the patient when used for medical applications.Nanoarmor can endow cells with self-driving capability, which has good prospects for applications in disease treatments.Nanoarmor can form heterojunctions on cells to facilitate electron transfer.Nanoarmor can be formed through biomineralization or biomimetic mineralization, with different involvements of the cell. Single cell modification or hybridization technology has become a popular direction in bioengineering in recent years, with applications in clean energy, environmental stewardship, and sustainable human development. Here, we draw attention to nanoarmor, a representative achievement of cytoprotection and functionalization technology. The fundamental principles of nanoarmor need to be studied with input from multiple disciplines, including biology, chemistry, and material science. In this review, we explain the role of nanoarmor and review progress in its applications. We also discuss three main challenges associated with its development: self-driving ability, heterojunction characteristics, and mineralization formation. Finally, we propose a preliminary classification system for nanoarmor. Single cell modification or hybridization technology has become a popular direction in bioengineering in recent years, with applications in clean energy, environmental stewardship, and sustainable human development. Here, we draw attention to nanoarmor, a representative achievement of cytoprotection and functionalization technology. The fundamental principles of nanoarmor need to be studied with input from multiple disciplines, including biology, chemistry, and material science. In this review, we explain the role of nanoarmor and review progress in its applications. We also discuss three main challenges associated with its development: self-driving ability, heterojunction characteristics, and mineralization formation. Finally, we propose a preliminary classification system for nanoarmor.