The invention discloses a tri-axial long spiral drilling machine and an occlusive pile construction method which is achieved on the basis of the tri-axial long spiral drilling machine. The tri-axial long spiral drilling machine comprises a rack. A guiding mechanism is installed on the rack and provided with a drilling mechanism. The drilling mechanism can be driven by a transmission mechanism to make vertically perpendicular movement in the guiding mechanism. The drilling mechanism comprises three laterally-arranged hollow drilling rods which are installed under power head, and the power head drives the three drilling rods to positively rotate and negatively rotate in a synchronous mode. Top openings of the drilling rods are connected with a concrete pouring device, and bottom openings of the drilling rods are provided with drilling bits which are opened when the drilling rods positively rotate and closed when the drilling rods negatively rotate. Rod bodies of the drilling rods are provided with spiral blades, and the spiral blades on each two adjacent drilling rods are arranged in a staggered and embedded-fit mode so as to enable the three drilling rods to be able to drill out of three mutually-occlusive pile holes at a time. In occlusive piles obtained through tri-axial long spiral drilling machine construction, occlusion between the adjacent piles is natural and sufficient, holes are not connected between the adjacent piles, and the construction quality is effectively ensured.