The utility model discloses a grinding-wheel grinding head for removing internal burrs of a small-caliber steel pipe. The grinding-wheel grinding head comprises a connecting plate, a positioning plate, a pneumatic grinding machine and a positioning wheel, wherein the outer side of the connecting plate is connected with a connecting rod of a pipe polishing machine, while the other side of the connecting plate is connected with the outer end of the positioning plate; the positioning wheel is mounted at the inner end of the positioning plate; and the pneumatic grinding machine is fixedly arranged under the middle part of the positioning plate. The grinding-wheel grinding head is characterized in that most structure of the previous pipe polishing machine is employed; the pneumatic grinding machine is fixed on the grinding head and compressed air is taken as power, so that the grinding head is capable of entering steel pipes with diameters ranging from pho 219 to phi 323 for removing the internal burrs in an off-line way; the grinding-wheel grinding head is simple in operation, high in production efficiency, good in internal burr removal effect without damaging a base material and other parts of the steel pipe, and capable of effectively reducing the formation of degraded pipes and waste steel and improving the steel pipe formation ratio. Besides, the grinding-wheel grinding head is simple in structure and low in manufacture cost.