Abstract: The plant fiberis an ideal polylactide acid (PLA) reinforcing component with the characteristics of low price, wide source, high specific strength, green renewable and biodegradable. In this paper, the characteristics of wood fibers, bamboo fibers, hemp fibers, crops straw fibers and fibers processing by-product are summarized from the category of plant fiber. And the research status of interface modification, molding process, aging degradation and functional material preparation of biodegradable composites by plant fiber reinforced PLA in recent years was comprehensively summarized. The development tendency of biodegradable composites by plant fiber reinforced PLA was proposed.