Rydberg atoms have been widely investigated due to their large size,long radiative lifetime,huge polarizability and strong dipole-dipole interactions.The position information of Rydberg atoms provides more possibilities for quantum optics research,which can be obtained under the localization method.We study the behavior of three-dimensional (3D)Rydberg atom localization in a four-level configuration with the measurement of the spatial optical absorption.The atomic localization precision depends strongly on the detuning and Rabi frequency of the involved laser fields.A 100％ probability of finding the Rydberg atom at a specific 3D position is achieved with precision of ～0.031λ.This work demonstrates the possibility for achieving the 3D atom localization of the Rydberg atom in the experiment.