A sustainable copolymer derived from natural sources, poly(decamethylene terephthalamide/decamethylene isophthalamide) (PA10T/10I), was synthesized along with a series of PA10T/10I composites incorporating graphene oxide (GO) at concentrations ranging from 0.05 to 1 wt.% via an efficient in-situ polymerization method. The study investigated the impact of varying GO content on the performance of PA10T/10I/GO composites. Antistatic property tests demonstrated that even a small amount of GO significantly reduced the surface resistance of PA10T/10I, with notable improvements observed at just 1 wt.%, enhancing the antistatic properties of the PA10T/10I matrix. Additionally, Differential Scanning Calorimetry (DSC) analysis revealed that the crystallization properties of PA10T/10I were improved by the incorporation of GO, with minimal changes in the melting points of the PA10T/10I/GO composites. The melting temperatures remained in the range of 289.6 ~ 281.9 ℃as the GO content varied from 0.05 to 1 wt.%. Thermogravimetric Analysis (TGA) and Heat Deflection Temperature (HDT) results showed that the PA10T/10I/GO composites exhibited excellent thermal stability, with PA10T/10I/GO-5 (containing 1 wt.% GO) achieving a higher HDT of 105.9 ℃, surpassing that of the PA10T/10I matrix by approximately 10 ℃. Mechanical testing indicated that the tensile strength of PA10T/10I/GO-5 was approximately 28.20% higher than that of PA10T/10I, while the bending strength increased by about 23.03%. This study presents an efficient approach for fabricating polyamide composites with outstanding antistatic, crystallization, thermal resistance, and mechanical properties via in-situ polymerization, thereby facilitating the practical application of GO-based fillers.