In order to nondestructively prepare polyamine modified polyethylene glycol terephthalate (PET) fabric, codepositionof catechol and polyethyleneimine onto PET fiber was conducted by the means of mussel-inspired method. Thesurface morphology, composition of woven fabric were investigated by FESEM and ATR-FTIR, XPS, respectively, whoseresults demonstrated successful modification has taken place on PET fiber surface. The TG-DSC data proved that the meltingtemperature and decomposition temperature increased from 253.78 oC and 394.08 oC to 255.01 oC and 398.21 oC,respectively. The surface polarity was characterized through the dynamic contact angle. The results indicated that the fabricdisplayed optimal surface properties at the PEI-CA mass ratio of 1:1. The modified PET fabric was utilized to prepare thefiber reinforced epoxy composite and its mechanical performances including tensile, flexural and short beam shear strengthwere evaluated. The obtained results indicated that the interlaminar shear strength (ILSS) has been significantly improved by57.02 %. The novel way to modify fabrics has great potential in recycling waste fabric for preparing fiber reinforcedcomposite.