Metamaterial structure‐based terahertz absorbers all are passive, once the preparation is complete, their absorption properties are also determined unable to adapt to the increasingly complex electromagnetic environment. In this paper, a kind of phase change film‐based tunable terahertz metamaterial absorber is proposed. And on the basis of current three‐layer type terahertz absorber on present metamaterial structure, a layer of vanadium dioxide (VO2) phase change film is added to change the conductivity of VO2 by controlling ambient temperature, so as to trigger the insulator metal transition characteristics of VO2 film, which can control the absorption rate of terahertz metamaterial absorber. Theoretically, design scheme in this paper has 80% modulation depth to the amplitude of absorption. That is, tunable terahertz electromagnetic absorber has potential application value in electromagnetic stealth in terahertz band, radiation detectors, and broadband communication fields.
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