The invention discloses a triangular section steel tube recycled concrete pier. The pier mainly consists of steel tubes (1) and U-shaped steel grooves (2), wherein the steel tubes (1) and the U-shaped steel grooves are mutually welded together to form the triangular pier; the U-shaped steel grooves (2) are formed by welding encasing steel pipes; shear resistant steel bolts (3) are arranged in the steel tubes (1) and the U-shaped steel grooves (2) respectively; recycled aggregate concrete (4) is cast in the steel tubes (1); normal aggregate concrete (5) is cast in the U-shaped steel grooves (2). The pier has the advantages of high bearing capacity, high integral stability, good seismic performance, simple construction process, low manufacturing cost, contribution to popularization, low carbon, environment friendliness and the like, can be applied to lower members of bridges with variable stress and larger torsion resistance requirements, is suitable for regions with higher seismic requirements or where engineering materials are difficult to arrive, and contributes to popularization and application of recycled concrete in bridge engineering and construction waste recycling.