The invention discloses a multi-element perovskite material, as well as preparation and application thereof. The multi-element perovskite material is multi-element fully-inorganic metal non-lead halide salt and has a perovskite structure; the chemical formula of the multi-element perovskite meets: (the formula is shown in the description), wherein x is greater than or equal to 0 and less than or equal to 1, y is greater than or equal to 0 and less than or equal to 1, A is Cs<+>, B1, B2, B3 and B4 are Na<+>, Ag<+>, In<3+> and Bi<3+> respectively, and X is a halogen element. Through improvement on the varieties and proportion of the key chemical elements of the perovskite material, being compared with the prior art, the multi-element perovskite material can effectively solve the problems that the conventional multi-element perovskite material has few varieties, and is difficult to regulate and control, and high in environmental pollution.