Electric circular saw with dust collecting device

The utility model discloses an electric circular saw with a dust collecting device. The electric circular saw is simple in structure, convenient to cut, not limited to metal cutting and wide in application range. The electric circular saw comprises an electric circular saw body, a fixed cover shell arranged on the body, a scrap discharging barrel arranged on the side face of the fixed cover shell and a scrap collecting box communicated with the scrap discharging barrel. An L-shaped locking groove is formed in the upper edge of the scrap collecting box, a protruding column is arranged on the upper portion of the scrap discharging cylinder, and an opening of the locking groove is opposite to the protruding column. A chip removal opening is formed in the outer side of the chip collection box, and a chip removal opening cover is arranged at the chip removal opening; the chip collecting box is made of transparent materials, a heat insulation box without a cover is arranged at the bottom in the chip collecting box,