The utility model discloses a protector can be dismantled to rotor craft, including installing the motor cabinet on aircraft motor cover, motor cabinet detachable be connected with the guard ring, the motor cabinet both ends are equipped with the round pin and end the hole, the guard ring include that one end is the fan -shaped connecting rod of fixing on the adapter, the connecting rod other end is upwards bent and is connected with the arc pole, the adapter lateral wall is equipped with the locating hole, the locating hole be located in the middle of two round pins end the hole, through ball head plunger and pivort fixation. The utility model discloses a guard ring has constituted protector at the outer loop of aircraft rotor, with organism, screw and on every side the object formed the isolation on the space, the effectual safety of protecting unmanned aerial vehicle, simultaneously, locating hole, tongue hole on ending hole, locking lever and correspond the guard ring through the round pin on the motor cabinet constitute twice detachable construction, and the different situation of being convenient for uses down, and is swift effective.