A laser alignment device of a circular saw machine includes a cover, a laser module, and a power control-supply unit. The cover defines a plurality of laser holes on a edge of the cover and a plurality of rectangular receiving slots. The laser module includes a rectangular base fixed in the rectangular receiving slot and a laser source-having a shooting portion corresponding to the laser hole. The power control-supply unit electrically connects to the laser module for simplifying parts and adding assembly speed.

 
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