Neighbor Guard is a drone fire-fighting system that can be installed at each community or the neighborhood nearby highly dense residences; when triggered a fire alarm, the system will send a signal to actuate and fly Neighbor Guard to the fire site immediately; it will shoot the dry powder fire-extinguishing balls into the house when arriving in front the window of house on fire that reduces the fire spread or puts out the fire rapidly. The appearance of Neighbor Guard is introduced a nostalgia element of fire hydrant and featured a proactive fire-fighting function; it improves the disadvantage of passive fire-fighting of original fire hydrant, and Neighbor Guard can be charged and reloaded the fire-fighting ball from the fire hydrant.