Monodisperse polymer microspheres refer to uniformly sized spherical polymer particles with diameters ranging from submicron to millimeter scale.Due to their homogeneous physical and chemical properties,monodisperse polymer microspheres have been demonstrated great potential for a wide range of advanced technology applications,including environmental protection,analytical chemistry,immunology,information and communication,standard measurement,catalysis,liquid crystal displays,and microelectronics.Over the past three decades,significant investigations and summaries have been conducted on the preparation methods,functional modification,and application of monodisperse microspheres.Based on the currently reported preparation methods of monodisperse polymer microspheres,this article summarizes the main representative methods,which are divided into process-molding methods and polymerization-molding methods.Recent advances in functionalization of monodisperse polymer microspheres,including functionalized microspheres and magnetic polymer microspheres,are also introduced.The current research status of the application of monodisperse polymer microspheres in analytical chemistry and water treatment is then highlighted.Finally,the future trends and perspectives for the preparation methods and development of monodisperse polymer microspheres are discussed.