The invention relates to a steel pipe beam viaduct, which comprises a plurality of stand columns in a shape of array along the width and length directions, beams arranged on each row of the stand columns along a width direction, a plurality of longitudinal beams arranged between the beams and a bridge deck arranged on the beams, wherein each stand column consists of steel pipes, and the beams aresupported by the stand columns; and the longitudinal beams also consist of the steel pipes. The viaduct adopts a plurality of steel pipes as the stand columns and the longitudinal beams; stand columntops adopt the beams with larger stiffness to improve the integral stiffness of a structure so as to enlarge the width of a bridge floor, and the beams can adopt rectangular or circular section shapesteel; and all the adopted steel pipes are shaped steel, have no need of additional processing, and have lower purchasing cost and construction cost and convenient construction. In addition, if the prior phi 609 steel pipes or phi 809 steel pipes are adopted and after the viaduct is disassembled, the steel pipes can be recovered so as to continue to be used as enclosure materials in the construction of a tunnel structure, steel pipe piles, steel casings and the like, and are favorable for saving resources.