Abstract: The seismic damage assessment of earth-rockfill dams can provide a basis for the post-earthquake emergency disposal and reinforcement, so higher requirements for the reliability of the evaluation methods and evaluation results are put forward. In order to reduce the subjectivity of the index weight calculated by analytic hierarchy process (AHP) and reflect the contribution of the index severity to the seismic damage assessment of the earth-rockfill dam, an information entropy variable weight fuzzy evaluation model is established. First of all, according to the research results of the earth-rockfill dam seismic damage, this paper expounds an seismic damage assessment index system and its classification standard, then AHP is used to determine the initial index weights, and the information entropy is adopted to modify it, and considering the indexes' severity impacts on the weights, a variable weight method is introduced to adjust weights again, and the fusion of the fuzzy evaluation method is made to finally develop a seismic damage assessment model for the earth-rockfill dam based on the information entropy-variable weight fuzzy. The evaluation results of the engineering examples show that this model effectively reduces the subjectivity of the index weight, and highlights the influence of the different indexes' severity on the evaluation results, so that the seismic damage assessment results of the earth-rockfill dams are more objective and accurate.