An electric dust-proof device includes a base seat, a driving mechanism,
and a dust-proof cover. The driving mechanism is disposed on the base
seat, and includes a power unit, and a drive unit. The drive unit
includes a sliding seat driven by the power unit, a pair of first and
second pushing portions disposed on the sliding seat and spaced apart
from each other, and a guiding assembly for guiding reciprocal movement
of the sliding seat along a direction. The dust-proof cover is disposed
pivotally on the base seat, and has an engaging portion disposed between
the first and second pushing portions, and a cover plate portion
connected to the engaging portion. The first and second pushing portions
cooperate to move the dust-proof cover between an open position and a
close position as a result of the reciprocal movement of the sliding
seat.