This study addresses the high-performance trajectory tracking control problem for uncertain robot systems, taking into account actuator faults and control input saturation. A fixed-time, prescribed-performance, fault-tolerant controller is proposed within the framework of nonsingular terminal sliding mode control. First, a novel fixed-time prescribed performance function is designed to enforce state constraints on both steady-state precision and transient performance of the robot's trajectory tracking position error. Then, a fixed-time prescribed performance fault-tolerant control method, which accounts for actuator partial failure and input saturation nonlinearity, is proposed to ensure faster transient response, higher steady-state accuracy, and improved robustness of the closed-loop system. Additionally, the Lyapunov stability theory is applied to prove that the trajectory tracking position error achieves fixed-time stability and satisfies the prescribed performance. Finally, the effectiveness and correctness of the proposed method are verified through numerical simulations and experiments conducted on a double-jointed robot system.