The invention relates to a coal mine working face drainage method. The method comprises the steps of (1) constructing a drainage hole between a return air crossheading of a working face to be mined and an adjacent working surface belt type crossheading; (2) constructing a sedimentation tank on a bottom plate next to the drainage hole; (3) installing a water pump in the sedimentation tank; (4) connecting the sedimentation tank water pump to a water bin through a drain pipe. The method can eliminate the construction of several thousands of meters of a drainage roadway and crossheading thereof, and reduce investment and a construction period. There is no need to close the crossheading to prevent a fire prevention extinguishing problem caused by non-tight closure of the crossheading.