The invention provides a polymer-base ceramic composite dielectric material which is characterized by comprising multiple dielectric material layers, including a first polyvinylidene fluoride layer and a composite material layer, wherein the composite material layer is arranged on one surface of the first polyvinylidene fluoride layer and contains 90-50 vol% of polyvinylidene fluoride and 10-50 vol% of nano barium titanate. The polymer-base ceramic composite dielectric material according to the embodiment of the invention has high dielectric constant and better processability. The invention also provides a capacitor and a preparation method of the polymer-base ceramic composite dielectric material.