Drill bit vertical auxiliary device of rotary drilling machine

The invention relates to the technical field of rotary drilling machines, and discloses a drill bit vertical auxiliary device of a rotary drilling machine, which comprises an excavator electric rod, a lifting fixing assembly is arranged on the excavator electric rod, an electric drill bit is arranged at the bottom of the lifting fixing assembly, and the electric drill bit is sleeved with a limiting cleaning assembly. A limiting telescopic assembly is arranged outside the limiting cleaning assembly, an alarm assembly is arranged below the limiting cleaning assembly, a supporting assembly is arranged at the bottom of the limiting telescopic assembly, and the bottom of a collision plate always collides with a limiting cavity, so that a cleaning plate is closed inwards to clean dirt attached to the outer surface of the electric drill bit; the problems that residues are clamped in threads of the electric drill bit and brought to other structures in the device to cause scratches, the electric telescopic rod cannot