The invention relates to a preparation technology of a centimetre wave-
millimeter wave compatible absorbing material. The material is of five-layer structure, and a substrate is an irregular surface made of any material; the topmost layer is a first layer, and mainly consists of a W-shaped
hexagonal ferrite absorbing agent and an
acrylic resin adhesive; a second layer is composed of a
carbonyl iron powder absorbing agent and an
epoxy resin adhesive, and a third layer is composed of a Fe85Si1Al6Cr8 nanometer
crystal thin absorbing agent and an
epoxy resin adhesive; a fourth layer is composed of a polycrystal iron fibre absorbing agent and an
epoxy resin adhesive; and a fifth layer is composed of a chopped carbon
fiber, a sooty mixed absorbing agent and a
polyurethane adhesive. A preparation process comprises the following steps: firstly, covering and preparing a bottom fifth-layer medium
coating on the substrate; and then successively covering and preparing a fourth-layer medium
coating, a third-layer medium
coating, a second-layer medium coating and a first-layer medium coating, wherein the coating preparation of each medium coating is as follows: uniformly stirring a
coupling agent, a diluting agent and the absorbing agent of each layer, standing, then adding the
adhesive of each layer, uniformly stirring to obtain a paint, coating the paint, and curing, thus obtaining the centimetre wave-
millimeter wave compatible absorbing material.