The invention discloses a dielectric structure type multiband radar absorbing material based on a low dielectric constant material. The radar absorbing material is composed of a dielectric structure type metamaterial structure and a total reflection lining board substrate; the dielectric structure type metamaterial structure is composed of at least two layers of dielectric structures, the two layers of dielectric structures are made of the same low dielectric constant material and adopt different shape and size designs, and by means of the special structure design, the purpose of preparing the radar absorbing material with a multiband absorbing effect from the single low dielectric constant material is achieved. The radar absorbing material is simple in design, low in cost, high in operability and suitable for the fields of radar absorbing, electromagnetic shielding and the like, and due to the fact that the low dielectric material has high oxidation resistance and high corrosion resistance, the multiband radar absorbing material designed through the method can serve in complex environments such as ocean.