The micro-grinding technology with micro-grinding machines and micro-grinding tools not only is able to manufacture geometrically complex 3D miniature components in a wide range of engineering materials,but also has small equipment volume,low energy consumption and low cost. Therefore,it attracts more and more attention of researchers worldwide. However,the research on micro-grinding technology is in its infancy,and there are many problems to resolve in micro-grinding mechanism,micro-grinding machine and micro-grinding tool. Therefore,it is very necessary to analyze the research state,existing problems and development tendency of micro-grinding technology deeply. The scope of micro-grinding technology is identified. The research states of micro-grinding mechanism and process,micro-grinding machine and its key components,and micro-grinding tool are fully summarized. On this basis,the basic problems faced by micro-grinding technology including grinding mechanism,micro-grinding machine and its key components,and micro-grinding tool are deeply discussed. Moreover,the development tendency of micro-grinding technology needing to be noted was further pointed out,which includes the ability of machining more engineering materials,compound process,high efficiency and high precision,intelligence and flexibility. It is expected to promote the application of micro-grinding technology and improve manufacturing level of ultra-precision miniature components in China.