The utility model discloses a hole stake method undercut tunnel stagnant water curtain, include and go up in the pilot tunnel of bight the stagnant water secant pile that the subtend interlock set up in subtend and vertical and two the lower bight pilot tunnels along four the bight angle pilot tunnels in tunnel excavation outline lines, two. The utility model discloses need not to handle construction ground precipitation, through set up in four bight pilot tunnels excavation outline lines in the tunnel outer, two go up in the pilot tunnel of bight subtend and vertical and two lower bight pilot tunnels in the stagnant water curtain that forms of the stagnant water secant pile of subtend, and only starch stagnant water box of wall formation in the transverse passage -way of being under construction to realize the technological effect of tunnel excavation section stagnant water. In addition, stagnant water secant pile and tunnel main part are strutted the steelframe and are formed powerful together and strut the system, and it is stronger struts the technological effect that the stratum deformation can be realized effectively making by the bearing capacity.