This paper proposes the construction method and validation of novel augmented extended state observer (NAESO). First, based on singular perturbation technique, the general formulation and structure of NAESO is derived. Based on which, the linear NAESO version is given. The merits of the presented NAESO include ease of parameter selection and sufficient noise-rejection ability, since the measurement output only exists in the last equation of NAESO, and thus the estimations of states are less sensitive to noises than that of classical ESO. Finally, simulations and comparisons with the classical ESO are presented, which validate the excellent performance of the proposed method in noise restraining.