The invention discloses a device for automatically threading a pipe. The device comprises a support, a driving mechanism and a steel chuck, and is characterized by comprising an upper driving wheel and a lower driving wheel; the upper driving wheel and the lower driving wheel are vertically opposite and are located on the same perpendicular face in the axial direction, concave arcs are formed in the middle of the upper driving wheel and the middle of the lower driving wheel respectively, the two vertically-opposite concave arcs are used for containing and clamping a rubber stick, a driving motor drives the upper driving wheel and the lower driving wheel to rotate simultaneously in opposite directions, and the support is provided with a hoisting lug for hoisting. The labor intensity can be lowered, lateral slippage can be avoided, and driving is powerful.