UniPortrait is an innovative framework for personalized portrait customization, achieving high fidelity single ID and multiple ID portrait customization through two modular plugins: the ID embedding module and the ID routing module. The model utilizes a decoupling strategy to extract editable facial features and embeds them into the context space of the diffusion model. The ID routing module adaptively combines and allocates these embedded features to their corresponding areas in the composite image, enabling customization for both single ID and multiple ID. UniPortrait demonstrates outstanding performance in single ID and multiple ID customization through a meticulously designed two-stage training scheme.