The invention discloses a bridge compound pier stud structure based on an orientation ECC and a construction process. The bridge compound pier stud structure comprises a pier stud plastic hinging areafor connecting a concrete pier stud base and a concrete pier stud. The pier stud plastic hinging area is of a reinforced concrete columnar structure. Concrete adopted in the pier stud plastic hingingarea is an oriented-fiber-enhanced cement-base composite. The oriented-fiber-enhanced cement-base composite is a cement-base composite with fibers in a cement base body arrayed in one direction. Thetending direction of the fibers in the oriented-fiber-enhanced cement-base composite is the same as the axial direction of the pier stud plastic hinging area. A reinforcing steel bar framework adoptedin the pier stud plastic hinging area is formed by binding a plurality of low-yield reinforcing steel bars and a plurality of high-strength reinforcing steel bars through reinforcement stirrups. Thelow-yield reinforcing steel bars and the high-strength reinforcing steel bars are parallel in pairs and located in different planes.