The invention relates to a circular saw blade, in particular to an indexable mechanically-clamped circular saw blade with hard alloy teeth. The circular saw blade comprises a saw blade body; toothholder positioning structures are uniformly distributed on the outer circumference of the saw blade body; cutter blocks are mounted on the toothholder positioning structures through screws. Compared with the prior art, the circular saw blade provided by the invention has the advantages that the cutter blocks are mounted on the toothholder positioning structures through the screws, and after being abraded, the cutter blocks can be quickly adjusted and reused by converting the positions of the cutting edges, so that not only can the cutting performance be improved, but also the cost of the cutter blocks is lowered.