The utility model relates to a distributed system of discharging fume of unanimity in tunnel. Reduce smoke textraction effect after the fixed point drawback of discharging fume lies in discharging fume the shaft mouth speed cigarette blockage effect appears after too high very easily, the stratosphere also can no longer be maintain very fast to the aerosol layer, and smog can produce in the tunnel and smuggle secretly. The utility model discloses set up many places smoke shaft at the two -way equal interval in tunnel top, two are listed as in vertical discharge flue of smoke shaft through horizontal discharge flue access digit central authorities above two tunnels, tunnel hunch portion opening position sets up the implantation muscle to be connected with smoke shaft, and the smoke shaft well bore sets up the wall seat and connects the stock, the blade opening angle of air door of discharging fume steadilys decrease 5 degrees along the smog flow direction one by one. The utility model discloses because of the even unanimity of shaft exhaust smoke level, can effectively maintain the aerosol layer, need not not be in the tunnel installation cost high, and the fire detection system that easily makes mistakes can reduce required smoke exhaust fan's power consumption volume by a wide margin.