External fire extinguishing system

The invention provides an external fire extinguishing system which comprises a fire extinguishing device, an air pipe, a first controller and a sensor, and an air outlet is formed in the fire extinguishing device; one end of the air pipe is communicated with the air outlet, and the other end of the air pipe is used for being connected into a working area of equipment to be protected; the first controller is electrically connected with the fire extinguishing device; the sensor is used for being arranged in a working area of the to-be-protected equipment and is in communication connection with the first controller; when the first controller determines that fire occurs in the to-be-protected equipment according to sensing data obtained by the sensor, the fire extinguishing device is controlled to release fire extinguishing gas, and the fire extinguishing gas enters the to-be-protected equipment through the gas pipe to extinguish fire. According to the external fire extinguishing system, the overall size of the t