Abstract: With the increase in the demand for carbon fiber (CF), CF scraps have increased dramatically, resulting in a great waste of resources. To solve this problem, CNT_x-SCF/TPU electrothermal nanocomposite materials were prepared by using short carbon fiber (SCF) felt fabricated by CF scraps through filtration method, with carbon nanotubes (CNT) as secondary filler and thermoplastic polyurethane (TPU) as the matrix, via vacuum hot pressing process. The composite materials were tested and analyzed using SEM, TGA, DSC, etc., and the optimal concentration of CNT was investigated. The mechanical and electrothermal properties of CNT_x-SCF/TPU composite materials were studied. The results show that CNT_1.0-SCF/TPU composite material exhibits highest electrical conductivity of 417.84 S/m using 60 g/m² SCF felt and a CNT concentration of 1.0 g/mL, representing a 34.78% improvement compared to the SCF/TPU without CNT. CNT_1.0-SCF/TPU composite exhibit significantly improved electrothermal performance at a low voltage of 3.5 V, reaching a temperature of approximately 165℃ in 240 s. It also represents advantages such as precise and stable electrothermal temperature control.