Integral three-edged casing drill rod

The invention discloses an integral three-edged casing drill rod. The integral three-edged casing drill rod comprises a rod body, a cylindrical pipe penetrating through hole is formed in the rod bodyin the axial direction of the rod body, and the rod body is provided with a chip removal guiding groove in a rifling shape; the rod body comprises a male connector, a first transition section, a connecting section, a second transition section and a female connector which are connected in sequence, and the connecting section is in an arc-shaped three-edged rod shape and is formed by cutting three rectangular planes a on a smooth-face round rod in an equal-angle mode; the end, close to the first transition section, of the male connector is in an arc-shaped three-edged rod shape and is formed bycutting three rectangular planes b on a smooth-face round rod in an equal-angle mode, and the outer wall of the end, away from the first transition section, of the male connector is provided with an outer thread; and the end,