The present invention relates to an electrostatic dust collector comprising a dust charging section and a dust collecting section; wherein said dust charging section comprises: a discharge electrode which is made up of a plurality of paralleled discharge wires, and a counter-electrode which is made up of a metal honeycomb net; and the plane formed by paralleled discharge wires is parallel to the metal honeycomb net; and wherein said dust collecting section comprises: positive metal electrodes and negative metal electrodes disposed alternately, and insulating spacers disposed between each of positive metal electrode and negative metal electrode. The present invention has advantages such as an improved efficiency to remove dust particles, a better ability to decompose harmful gases, a simple structure and a low production cost.