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The demand for flexible and freestanding electromagnetic interference (EMI) shielding materials are more and more urgent to combat with serious electromagnetic (EM) radiation pollution. Two-dimensional Ti3C2Tx is considered as promising EMI shielding material to graphenes because of the low cost and high electrical conductivity. However, the shielding performance still needs to be optimized to decrease the reflection effectiveness (SER) and increase absorption effectiveness (SEA). Herein, we prepared Ti3C2Tx-bonded carbon black films with a porous structure. The SER decreased from 20 dB to 12 dB and the SEA increased from 31 dB to 47 dB. The best EMI shielding effectiveness can be as high as 60 dB with SEA of 15 dB and SER of 45 dB. Their calculated specific shielding effectiveness can be as high as 8718 dB cm2/g. These results indicate that the porous structure can enhance the absorption of the EMI shielding films, resulting from the enhanced scattering and reflection. Consequently, this work provides a promising MXene-based EMI shielding film with lightweight and flexibility.