The present disclosure discloses an MXene-based terahertz wave broadband super-strong absorbing foam, and belongs to the technical field of electromagnetic functional materials. The MXene-based terahertz wave broadband super-strong absorbing foam includes a porous polymer foam and a MXene nanosheet attached onto the porous polymer foam, wherein the MXene nanosheet is attached onto the porous polymer foam in a coating form, a film forming form and a suspension form; the average pore diameter of the porous polymer foam ≥500 μm, the thickness of the porous polymer foam ≤10 mm, and the filling mass of the MXene nanosheet is less than 50% of the mass of the absorbing foam.