Circular saw

The utility model discloses a circular saw. The circular saw comprises a driving part, a base-plate part, and an adjusting device, wherein the base-plate part is used for propping against a cut work-piece, and the driving part arranged on the base-plate part can rotate corresponding to the base-plate part and is used for adjusting the position relation of a saw blade corresponding to the base-plate part; the adjusting device used for adjusting a relative position relation between the driving part and the base-plate part is arranged between the driving part and the base-plate part, and comprises a depth plate, a guide block and a retaining device, wherein the depth plate is arranged on the base-plate part, the guide block capable of sliding along the depth plate is arranged on the driving plate, and the guide block rotates corresponding to the base-plate part along the driving part so as to slide along the depth plate; the retaining device can be retained on the depth plate so as to limit the distance of rotat