As the fields in which electromagnetic interference shielding composites are applied become more diverse, polymer materials with excellent mechanical properties, high EMI shielding effect and capable of long-term operation are highly desired. Herein, we prepare flexible and self-healing EMI shielding composites via the incorporating Ti3C2Tx Mxene into crosslinked polyurethane (PU) organogel bearing Diels-Alder (DA) adduct. The MXene/PU composites exhibit the high self-healing efficiency determined by the recovery of tensile strength and EMI shielding effectiveness after the heat treatment. In addition, the oxidation stability of MXene in the composite is evaluated by monitoring the UV-vis absorption profile and the morphology of TEM images as a function of storage time under an air atmosphere. Further, high flame-retardant properties were achieved due to the high char residue generated from DA adduct and MXene.