Micro-supercapacitors (MSCs) are promising energy storage devices due to their high power density, long cycle life, and environmental friendliness. This review summarizes recent advancements in electrode materials for MSCs, highlighting key research achievements, challenges, and future directions. MSCs operate through either electric double-layer capacitance (EDLC) or pseudocapacitance, with the latter involving redox reactions. EDLC relies on ion adsorption on electrode surfaces, while pseudocapacitance involves fast Faradaic reactions. Carbon-based materials, such as graphene, carbon nanotubes (CNTs), and activated carbon, are widely used for EDLC due to their high surface area and conductivity. Pseudocapacitive materials include metal oxides (e.g., MnO₂, RuO₂), hydroxides, sulfides, and conductive polymers (e.g., polypyrrole, polyaniline). These materials offer higher energy density but face challenges in conductivity and stability. Hybrid capacitors combining EDLC and pseudocapacitance are promising for high power and energy density. MSCs are classified into sandwich and planar interdigitated structures, with the latter offering better performance due to shorter ion diffusion paths. Preparation methods include lithography, electrochemical deposition, CVD, extrusion injection, inkjet printing, and screen printing. Carbon-based electrodes, such as graphene and CNTs, provide high conductivity and surface area, while transition metal oxides and sulfides offer high pseudocapacitance. Recent studies have focused on composite materials, such as graphene oxide with metal oxides, to enhance performance. MSCs are suitable for flexible and wearable electronics due to their small size and compatibility with various substrates. Despite progress, challenges remain in scalability, cost, and long-term stability. This review emphasizes the importance of material design, fabrication techniques, and integration with micro-devices for the commercialization of MSCs.Micro-supercapacitors (MSCs) are promising energy storage devices due to their high power density, long cycle life, and environmental friendliness. This review summarizes recent advancements in electrode materials for MSCs, highlighting key research achievements, challenges, and future directions. MSCs operate through either electric double-layer capacitance (EDLC) or pseudocapacitance, with the latter involving redox reactions. EDLC relies on ion adsorption on electrode surfaces, while pseudocapacitance involves fast Faradaic reactions. Carbon-based materials, such as graphene, carbon nanotubes (CNTs), and activated carbon, are widely used for EDLC due to their high surface area and conductivity. Pseudocapacitive materials include metal oxides (e.g., MnO₂, RuO₂), hydroxides, sulfides, and conductive polymers (e.g., polypyrrole, polyaniline). These materials offer higher energy density but face challenges in conductivity and stability. Hybrid capacitors combining EDLC and pseudocapacitance are promising for high power and energy density. MSCs are classified into sandwich and planar interdigitated structures, with the latter offering better performance due to shorter ion diffusion paths. Preparation methods include lithography, electrochemical deposition, CVD, extrusion injection, inkjet printing, and screen printing. Carbon-based electrodes, such as graphene and CNTs, provide high conductivity and surface area, while transition metal oxides and sulfides offer high pseudocapacitance. Recent studies have focused on composite materials, such as graphene oxide with metal oxides, to enhance performance. MSCs are suitable for flexible and wearable electronics due to their small size and compatibility with various substrates. Despite progress, challenges remain in scalability, cost, and long-term stability. This review emphasizes the importance of material design, fabrication techniques, and integration with micro-devices for the commercialization of MSCs.