[Purposes] To evaluate the feasibility of using recycled construction waste aggregates as aggregates in precast piles and to investigate their durability in soft soil treatment engineering environments. [Methods] Optimal water-cement ratios and recycled aggregate replacement rates for precast piles were determined through mechanical property, elastic modulus, and slump tests under various mix designs. Subsequently, durability tests were conducted by simulating erosion environments in soft soil foundations. Test specimens of recycled concrete precast piles were placed in clean water, sulfate solution, and fulvic acid solution, with natural aggregate concrete precast pile specimens serving as the control group. By comparing the mass, compressive strength, and splitting tensile strength of the specimens before and after erosion, the evolution patterns of their properties were summarized. Based on these findings, a predictive model for the mechanical properties of recycled concrete precast piles was established. Combined with scanning electron microscopy (SEM) micrographs, the degradation mechanism was elucidated. [Findings] The optimal comprehensive performance of recycled concrete precast piles was achieved at a water-cement ratio of 0.45 and a recycled aggregate replacement rate of 30%. In long-term water immersion environments, their mass, compressive strength, and splitting tensile strength initially increased with erosion time before stabilizing. Under sulfate and fulvic acid erosion conditions, strength continuously decreased and gradually stabilized after approximately 150 days, while mass exhibited a trend of first increasing and then decreasing. The most significant erosion occurred in 10g/L sodium sulfate solution and pH=5 fulvic acid solution. Under all erosion conditions, the stable compressive strength of recycled concrete precast piles consistently exceeded 30MPa, meeting the minimum strength requirements for precast piles specified in engineering standards. [Conclusions] The use of recycled construction waste aggregates to fabricate precast piles for soft soil treatment projects is feasible, with both mechanical and durability properties meeting engineering application requirements.