Flue gas exhausting pipe line

The utility model discloses a flue gas discharge pipe including a pipe, a flue gas inlet, a flue gas outlet and a pipe joint. The pipe comprises a main pipe and a secondary pipe which are disposed in parallel; the secondary pipe is disposed with the baffle-type flue gas inlet on one side; a fixed funnel-shaped oil collector is disposed next to the lower part of the flue gas inlet and the flue gas outlet is disposed on the top of the oil collector to butt with the flue gas inlet of the main pipe. The utility model of flue gas discharge pipe can not only solve the problems of flue gas runaway, back flow and other fire or smoke hidden problems, but also solve the problem of treatment of deposited oil stain in the process of discharging flue gas. Therefore, the utility model can be widely used in the centralized discharge system for flue gas in hotel, restaurant and residential building.