This paper from the unified visual angle of philosophy and economics has observed Marx＇s theory of ecological economics, clarified the misunderstanding on Marx＇s theory of nature and ecological environmental thought at home and abroad for a long time, studied systematically and deeply the Marx＇s thought that natural and ecological environment is external condition and internal elements of human social economic growth, confirmed firstly Marx is the forerunner who established the theory of internal cause of natural ecological environment. It is of far-reaching academic and practical significance.