The invention provides a lightning stroke hazard measurement device for a multi-rotor-wing unmanned plane, and the device is provided with a lightning stroke alarm system. The lightning stroke alarm system comprises an induction voltage sensing device, an induction voltage amplification module, and a signal processing module. The induction voltage sensing device is disposed on the multi-rotor-wing unmanned plane, and is used for collecting an induction voltage of the multi-rotor-wing unmanned plane. An induction voltage is amplified and then compared with a set threshold value. When the amplified induction voltage is greater than the set threshold value, the signal processing module transmits a lightning stroke hazard early-warning signal. The device can carry out the measurement and evaluation of the lightning stroke hazard when the unmanned plane is in use, transmits an evaluation result to an unmanned plane operator in real time, enables the multi-rotor-wing unmanned plane to be able to normally work in a rainy data, can greatly improve the operation time window and duration of the multi-rotor-wing unmanned plane, reduces the lightning stroke hazard of the unmanned plane, and guarantees the operation safety of the unmanned plane. The invention also provides the multi-rotor-wing unmanned plane.