EgoGaussian is an advanced 3D scene reconstruction and dynamic object tracking technology. It can reconstruct 3D scenes and track the movement of objects dynamically using only RGB first-person perspective input. This technology leverages the unique discrete properties of Gaussian scattering to segment dynamic interactions from the background. Through a piece-wise online learning process, it utilizes the dynamic characteristics of human activities to reconstruct the evolution of the scene in chronological order and track the movement of rigid objects. EgoGaussian outperforms previous NeRF and dynamic Gaussian methods in wild video challenges and delivers exceptional quality in reconstructed models.