Although tremendous efforts have been made to convert woody oils into valuable chemicals, most of the known protocols still require multi-step procedures and rigorous conditions. Herein, a highly efficient method for converting woody oils into long-chain unsaturated dicarboxylic acid was reported. Such a strategy holds promises for opening new routes for utilizing woody oils. Firstly, self-metathesis of fatty acids from Rubber seed oil (RSO), Sapium sebiferum oil (SSO) and High oleic Canola oil (HOCO) were optimized. Pure E -octadec-9-enedioic acid monomer (C18) was obtained, and confirmed by 1 H NMR and FTIR spectra. The prepared dicarboxylic acid was then experienced condensation polymerization with 1,6-hexamethylenediamine. The chemical structures of the obtained polyamides were investigated by FTIR and 13 C NMR spectra. DSC, TGA, DMA, and tensile testing was used to explored their thermal and mechanical properties. Interestingly, due to the existence of broad melting and glass transition, the prepared polyamides possess multiple-shape memory properties. • Woody oils were successfully converted into long-chain unsaturated diacid via self-metathesis. • Although woody oils contain high content of polyunsaturated fatty acids, only C18 were obtained via self-metathesis. • Mechanical strong polyamides with multiple shape-memory property were obtained via polycondensation.