A cutting blade has two ends and two sides and includes a mounting hole mounted on a front housing of a brush cutter; a convex member on a central portion of either side and having two notches at two ends respectively and an intermediate, curved cutting edge; and two cutting edges on either side with the convex member disposed between, each cutting edge having a first end terminated at the notch and a second end terminated at either end. Two cutting edges of different sides with the mounting hole disposed between comprise a plurality of groups of an outward inclined cutting member and a cavity. The other two cutting edges of different sides with the mounting hole disposed between comprise a plurality of groups of an inward inclined cutting member and a recess.
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