The utility model discloses an excavating working face high-concentration gas drainage device, comprising a three-way pipe, a valve, a vertical pipe and a drainage pipe, wherein the three-way pipe is in serial connection with a main drainage pipeline and the vertical pipe is connected with an upper part of the three-way pipe via the valve. An upper end of the vertical pipe is horizontally connected with the drainage pipe, which is provided at the pipe wall with a plurality of ventilation holes in a uniform manner and at the internal with a metal thin gauze. The high-concentration gas in a relatively long tunnel can be eliminated rapidly, thereby reducing a great threat to safe production. The excavating working face high-concentration gas drainage device has the characteristics of simple structure, safety, reliability and convenient utilization etc.