Variable-angle autorotation type rotary excavating drill bit

The utility model discloses a variable angle autorotation type rotary excavating drill bit in the technical field of root pile drill bits, the drill bit structure comprises a shell and a rotating shaft, a plurality of drill bit installation shafts annularly arranged on the outer side of the rotating shaft are arranged on the shell in a penetrating mode, detachable drill bits are installed at the bottoms of the rotating shaft and the drill bit installation shafts, and the rotating shaft is located on the outer wall of the shell and sleeved with a driving gear. The outer wall of the drill bit mounting shaft is sleeved with a driven gear through a floating structure, and an adjusting structure is arranged at the top end of the drill bit mounting shaft. According to the novel drill bit of the rotary drilling rig, self-rotation type root pile drilling equipment is formed through the single-shaft transmission type principle, the function of multiple gradients is achieved through an adjusting system on the drill bit