A nose hair trimmer with dual cutting edges which comprises a stationary blade with a plurality of teeth disposed on two opposite longitudinal sides thereof; a movable blade with a plurality of teeth disposed on two opposite longitudinal sides thereof, and the movable blade is driven by a driving unit to move in a linear reciprocating manner against the stationary blade so that the teeth on one side of the stationary blade and the teeth on one side of the movable blade cooperate with each other to define a first cutting edge, and the teeth on the other side of the stationary blade and the teeth on the other side of the movable blade cooperate with each other to define a second cutting edge; and a casing having a head portion in shape and size adapted to be inserted into a human nose, and the head portion is provided with two longitudinal openings disposed opposite to each other for exposing the first cutting edge and the second cutting edge respectively, so that the first cutting edge and the second cutting edge are positioned substantially parallel to a longitudinal axis of a nasal passage of a human nose when the head portion is inserted into the nose.
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