The present disclosure relates to an underground roadway construction method, and more particularly, to a method of constructing an underground roadway manufactured by placing concrete by connecting the PC base with connection reinforcing bars between the PC bases after installing the PC base using precast concrete. will be. A method for constructing an underpass according to an embodiment of the present disclosure includes a first step of continuously installing a pair of PC pillars with a horizontal connecting muscle embedded in the lower part along the longitudinal direction from the upper surface of the underpass foundation, and A second step of installing the connecting reinforcing bars in the horizontal and vertical directions by extending to the horizontal connecting bars between the pair of PC columns, and a third step of pouring concrete into the connecting reinforcing bars installed between the pair of PC columns, And a fourth step of installing corrugated steel sheets for interconnecting the upper portions of the PC pillars, and a fifth step of paving the upper part of the poured concrete.
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