Abstract This article presents a robust fixed‐time cooperative control scheme for high‐order nonlinear multi‐agent systems under event‐triggered communication. A fixed‐time leader‐states estimator with event‐triggered communication is first designed to reconstruct the essential information, since only a fraction of agents can access the leader. Subsequently, we develop a disturbance observer‐based fixed‐time dynamic surface controller that utilizes the estimated leader state. The fixed‐time convergence of the whole closed‐loop system is proved by Lyapunov stability theory. Finally, numerical simulations elucidate the validity of the theoretical result.