Flue fire extinguishing system and ship

The invention discloses a flue fire extinguishing system and a ship. The flue fire extinguishing system comprises an electric control box, a flame sensor, a pressure water tank, a pressure gauge and a water mist nozzle, the water mist nozzle and the flame sensor are both arranged in the flue, the pressure water tank is provided with a liquid outlet pipeline communicated with the water mist nozzle, and an electromagnetic valve is installed on the liquid outlet pipeline; the pressure water tank is provided with a liquid inlet pipeline, the liquid inlet pipeline is provided with a stop valve, and the pressure gauge is used for detecting the pressure of the pressure water tank in real time; the flame sensor and the electromagnetic valve are both connected with the electrical control box, when the flame sensor senses flames, the flame sensor transmits signals to the electrical control box, and the electrical control box controls the electromagnetic valve to be opened. The water mist fire extinguishing system is ad