Erosion-corrosion occurs in petroleum, chemical engineering and other fields, and causes damage or failure of equipment materials. After laser cladding, the material has special chemical and mechanical properties and can form a metallurgical bond with the matrix material. Based on the research method of erosion-corrosion behavior of laser cladding layer, the advantages and disadvantages of field test method, numerical simulation method and three kinds of experimental devices by simulating real working conditions were briefly summarized, and the current characterization methods used for evaluating erosion-corrosion behavior were also concluded. Then, the research status of the erosion-corrosion mechanism of laser cladding layer was introduced. The erosion-corrosion mechanism was composed of electrochemical corrosion, mechanical force wear and the interaction of the two. The erosion mainly promoted corrosion through two erosion mechanisms of normal stress and shear stress, while corrosion promoted erosion by weakening the surface of the coating. Subsequently, the influencing factors of the erosion behavior of laser cladding layer were concluded and the effects of fluid factors such as flow rate, erosion angle, solid particles and pH value, temperature and other liquid phase factors on the erosion-corrosion behavior of laser cladding layer were analyzed and summarized. Finally, based on the research status of erosion-corrosion mechanism, the problems in the research of erosion-erosion of laser cladding layer are summarized from the research methods and influencing factors. At the same time, the future research trends are prospected.