This article revisits Aristotle's god in his Metaphysics through Hegel's two concepts of infinity. Firstly, it gives a brief introduction to the concept of true infinity and bad infinity in Hegel's The Science of Logic. Then, it introduces the theology in the book Lambda of Metaphysics, and points out Hegel's misinterpretation of Aristotle's theology in his Lectures on History of Philosophy. Through the study of this misinterpretation, this article finds out a basic difference between Hegel's and Aristotle's theology: Hegel's god is one absolute as all; but Aristotle's god is one of all. Hence, Hegel's god has the quality of true infinity and Aristotle's god has the quality of bad infinity