The invention discloses a drill rod connecting hoop, which comprises a tubular connecting hoop main body made of steel, wherein the connecting hoop main body is provided with an internal thread; the peripheral surface of the connecting hoop main body is provided with opposite flat bottom grooves; the area outside the flat bottom grooves on the peripheral surface of the connecting hoop main body is provided with a polytetrafluoroethylene jacket; the interface between the connecting hoop main body and the polytetrafluoroethylene jacket is provided with mutually matched convex-concave structures; and the peripheral surface of the polytetrafluoroethylene jacket is provided with a plurality of axial grooves uniformly distributed along the circumference. The drill rod connecting hoop has the advantages that: the polytetrafluoroethylene jacket is increased on the outer surface of the metal connecting hoop, the interface between the metal connecting hoop and the polytetrafluoroethylene jacket is provided with the mutually matched convex-concave structures, and the peripheral surface of the polytetrafluoroethylene jacket is provided with the plurality of axial grooves uniformly distributed along the circumference, so the surface overflowing area can be increased, and the abrasion resistance of the connecting hoop is improved; and because the polytetrafluoroethylene has super strong corrosion resistance and scaling resistance, the drill rod connecting hoop has long service life and low maintenance frequency.