Abstract: The line type polyurethane containing furan rings was prepared by diisocyanate (MDI), polyether polyols (PTMG) and 2, 5-furandimethanol. The cured thermoreversible polyurethane was synthesized by Diels-Alder reaction between bismaleimide (BMI) and the line type polyurethane containing furan rings, and the unidirectional carbon fiber composite was prepared. The thermal reversible behavior of the cured thermoreversible polyurethane was analyzed through high-temperature FTIR and DSC. The solubility, melt reprocessing ability and mechanical properties of the cured thermoreversible polyurethane were studied, the mechanical properties and dynamic mechanical properties of carbon fiber composites were also analyzed. The results show that the cured thermoreversible polyurethane has a repeated behavior of bond breaking and cross-linking during thermal cycling, and the reversible reaction is completed about 160℃. Both high-temperature dissolution process and hot-melt process can be used for reprocessing. After being reprocessed three times, the original mechanical properties of the cured thermoreversible polyurethane can still be maintained. The interlaminar shear of unidirectional carbon fiber composites was characterized by secondary failure, and the interlaminar shear strength is 34.85 MPa. The glass transition temperature of thermoreversible polyurethane is 93.73℃.