An overload protection device includes a motor, a transmitting shaft, a driving wheel, a resilient member, a sensor and a controller. The transmitting shaft including driving arm is meshed with the motor. The driving wheel is rotably engaged with the transmitting shaft at a distal end. The resilient member is connected to the driving arm at one end, and connected to the driving wheel at another end for driving the driving wheel to rotate. The sensor is mounted on the driving wheel and covered by the driving arm, and configured for and outputting a signal when the transmitting shaft is rotated relative to driving wheel. The controller is installed in the transmitting shaft and electrically coupled with the sensor for receiving the signal outputted from the sensor and shutting down the motor correspondingly.