The invention discloses a flat micro-electrostatic filter which comprises a field power module and a dust collecting module. A discharge electrode is located in the center of each discharge cavity, and conducting rods are sequentially connected with the corresponding discharge electrodes. The dust collecting module is composed of dust collecting module channels. A positive plate and a negative plate of each dust collecting module channel are both composed of metal electrodes and surface coatings. Compared with other electrostatic filters, the carrying capacity of particulate pollutants is higher, and filtering efficiency is higher; in the air flowing direction, laminar flowing inside the dust collecting module channels is adopted, filtering efficiency is higher, and outlet air is more uniform; and the different requirements for mechanical strength and resistance can be met through channel sections in different shapes, and the application range of the flat micro-electrostatic filter is expanded.