Piling alarm device for preventing damage to drilling bit

The invention belongs to the field of piling, and particularly relates to a piling alarm device for preventing damage to a drilling bit. The piling alarm device is characterized in that a vibration sensor can transmit signals to a controller, the controller is correspondingly connected with an alarm circuit and a shutdown circuit, and the shutdown circuit can control a shutdown motor capable of driving the rotation of the drilling bit; the shutdown circuit is composed of a sixth resistor, a seventh resistor, a eighth resistor, a first light-emitting diode, a second light-emitting diode, a photoelectric triode, a first inductor, a first diode, a first triode and a second switch, wherein the first light-emitting diode and the photoelectric triode form a photoelectric coupler, and the vibration sensor is connected with the controller in a specific mode. According to the piling alarm device, an early warning and shutdown device is provided for the drill bit to drill irregular hard objects, and the drill bit can b