The invention discloses a PM2.5 (Particulate Matter 2.5) electrostatic precipitator with a box-type dedusting area. After being arranged in a common electrical dedusting system, the PM2.5 electrostatic precipitator with the box-type dedusting area comprises a coagulation area and the box-type dedusting area which are successively communicated, wherein the coagulation area is conducted with the common electrical dedusting system and is provided with a plurality of dust collection plates at equal intervals to form a plurality of particulate channels which have the consistent direction with particulates; the same particulate channel is provided with discharging electrodes which are vertical to the particulate direction and have the same polarity; the polarities of the discharging electrodes in adjacent particulate channels are opposite, the particulates passing through the area can be provided with different electric charges, and the particulates are coagulated to form big-particle particulate; the box-type dedusting area is communicated with the coagulation area and is provided with a box-type dust collecting films at equal intervals; the bottom of each box-type dust collecting film is hung to form a big-particle particulate channel through which the big-particle particulate can pass; the box-type dust collecting film is provided with a negative electric charge by a connected power supply; the film body structure of each surface of the box-type dust collecting film is consistent and is formed by respectively arranging a polypropylene film on the upper surface and lower surface of a conducting film; and static dust removal is finished in the area. The PM2.5 electrostatic precipitator has the advantages of excellent effect and low cost.