The utility model discloses a fire fighting water distribution system for a nuclear power plant. The fire fighting water distribution system comprises a pressure stabilizing system and a distribution system which are connected, wherein the pressure stabilizing system comprises a first air pressure energy storage tank and a second air pressure energy storage tank, as well as a first air compressor and a second air compressor; the distribution system comprises a main looped network, and the main looped network is formed by connecting a plurality of main connecting pipelines; outlets of the first air pressure energy storage tank and the second air pressure energy storage tank are connected to the main connecting pipelines respectively, and at least two first isolating valves are additionally arranged on the main connecting pipeline between the outlets of the first air pressure energy storage tank and the second air pressure energy storage tank. According to the fire fighting water distribution system for the nuclear power plant, by connecting the outlets of the two air pressure energy storage tanks to the main connecting pipeline of the distribution system respectively and by arranging the at least two isolating valves between the outlets of the two air pressure energy storage tanks, seamless switching between the two air pressure energy storage tanks is realized; and when one of the isolating valves is overhauled, the two air pressure energy storage tanks are not isolated simultaneously, thus guaranteeing normal operation of the pressure stabilizing system.