The invention relates to an electric dust collector, aiming at providing a small-sized electric dust collector with an easily operated cyclone separating dust collecting part. In the invention, a cyclone separating tube (104) for centrifugal separating and dust collecting and a dust collecting box (105) provided with a first auxiliary filter (106) inside are independently detachably arranged in parallel on a lower shell (101) of a dust collector body (1); part of the gas exhausted by the cyclone separating tube (104) flows into an electric blower through the dust collecting box (105). Furthermore, in the invention, the cyclone separating tube (104) for centrifugal separating and dust collecting and the dust collecting box (105) provided with the first auxiliary filter (106) inside are independently detachably arranged in parallel on the lower shell (101) of the dust collector body (1); part of the gas exhausted by the cyclone separating tube (104) flows into the electric blower throughthe dust collecting box (105) and a filter arranged below.