Aiming at the anchoring method of the anchoring hole to the anchor cable and the excessive tensile stress around the traditional trapezoidal anchoring hole, the middle pier of a prestressed pier of a project was taken as the research object to establish a 3-dimensional finite element model. According to the geometric characteristics of the cardioid curve, the shape of the cardioid anchoring hole was proposed. The trapezoidal and cardioid anchoring holes were compared under different load combinations, and the design parameters were studied in depth. The results showed that the cardioid anchoring hole has lower tensile stress and better stress than the traditional trapezoidal anchoring hole. The upstream curved surface of the cardioid anchorage tunnel changed into a straight surface, which can effectively control the volume of the anchorage tunnel and can be as close as possible to the downstream surface center under the construction conditions. The distance between the top surface of cardioid anchoring hole and the downstream surface to the top anchor cable is 1.5~2.0 m, and the distance between the bottom surface and the downstream surface to the bottom anchor cable is 1.2~1.5 m, which is reasonable.