The present application provides a material for three-dimensional molding, and a three-dimensional object and a sliced layer thereof. The material comprises: a powder material, comprising a polyamide powder and/or a modified polyamide powder; and a liquid material, comprising a first active component. wherein the first active component is capable of polymerization, the first active component dissolves at least part of the polyamide powder and/or the modified polyamide powder, and the powder material itself does not polymerize and does not polymerize with the first active component. The material for three-dimensional molding, and the three-dimensional object and the sliced layer thereof provided by embodiments of the present application can effectively improve the mechanical strength and density of a three-dimensional object.