The invention discloses a filling material and application thereof. The filling material is a mixture composed of gellan gum and gelatin; the mass ratio of the gellan gum to the gelatin is (1-1.5):(2-3). Compared with the prior art, the filling material and the application thereof disclosed by the invention have the benefits that through improving the specific components of the filling material and the ratio among the components as well as whether acyl is included in the gellan gum, and the like, the problems of low transparency, soft in quality, low in gelation speed and the like of the filling material are effectively solved, the filling material is particularly suitable for making a medical model to obtain the medical model with high transparency, gel elasticity and moderate strength, and the filling material is high in gelation speed and is very convenient for practical application.