With the rapid development of electronic devices towards high level of integration and high power, heat dissipation has become a key problem restricting their further development. Heat pipe, benefiting from vapor-liquid phase change, has become one of the most efficient methods for heat transfer, and has been widely used in many different fields, including aerospace, aviation, and power electronics. All these applications call for both high performance of heat transfer and long service life for heat pipes. Corrosion plays a critical role in affecting the service life of heat pipe. There are many factors contributing to corrosion inside heat pipes, including poor compatibility between heat pipe material and working medium, bubble fracture and fluid erosion in heat pipe, etc., and the study of corrosion inside heat pipe shows increased importance. In this paper, different types of corrosion existed in heat pipe, and the important influencing factors (working medium, temperature, gas or vapor, etc) are discussed in detail. The corresponding corrosion mechanisms and corrosion protection methods are presented, and the typical examples of heat pipe corrosion are described. In the end, the future development direction of heat pipe corrosion is also discussed.