The invention discloses a centrifugal model test method for a reinforced soil high fill side slope. The method comprises the steps of A1, determining a prototype of the reinforced soil high fill sideslope, and making the same fill side slope shape; A2, on the basis of the composition of a prototype filler and mainly according to a strength equivalence principle, screening and preparing main similar simulation materials of an indoor model separately; A3, making the main similar simulation materials selected in step A2 into an indoor experimental model according to the prototype, embedding a sensor in the model, and installing high-definition cameras on the front and side faces of the model to observe the model; A4, arranging the experimental model in a large geotechnical centrifuge, and compensating for the self-weight reduced due to the shrinkage of the model through the centrifugal acceleration. The method has the advantages that the self-weight reduced due to the shrinkage of the model is mainly supplemented by using the large centrifuge to apply the centrifugal acceleration; the prototype materials or remodeling materials which have properties consistent with those of the prototype materials are used as the materials of the model, and therefore it is ensured that a simulation result can truly reflect the actual force bearing and stability conditions of the reinforced soil high fill side slope.