农民工已成为我国城市和农村经济发展的主要力量,但他们的职业健康却面临着严重的威胁。文章从外部成本、信息不对称和供求关系分析农民工职业健康困境的原因,通过外部成本内部化,消除农民工和企业之间的职业危害信息不对称,改善农民工的职业健康。 Migrant workers have become the major force in the economic development of our cities and rural areas, but their occupational health is facing serious threats. This paper analyzes the reasons of migrant workers’ occupational health problems from external costs, information asymmetry and the relationship between supply and demand. Through the internalization of external costs, the information asymmetry of occupational hazards between migrant workers and enterprises is eliminated and the occupational health of migrant workers is improved.