A shaper guard includes a fixture assembly having a sleeve adapted to be statically fixed on a shaper and a rotating member pivotally connected with the sleeve. A first guard panel has a connecting portion connected with the sleeve. A second guard panel has a connecting portion connected with the rotating member and is pivotable in concert with the rotating member with respect to the sleeve and the first guard panel. The second guard panel is biasable by the workpiece fabricated on the shaper. The shaper guard has a simple structure.