The invention discloses a preparation method of a meltable reinforced polyvinyl alcohol (PVA) composite, which comprises the following steps: (1) adding carbon nanotubes (CNT) into composite plasticizer containing a dispersion medium, stirring, and performing ultrasonic auxiliary dispersion for 1.5-4 hours to obtain a plasticizer solution; and (2) performing uniform incubation mixture on the plasticizer solution in the step (1) and a PVA resin to obtain the meltable CNT reinforced PVA composite. The invention also discloses the meltable reinforced PVA composite material prepared through the preparation method. According to the invention, the CNTs are dispersed in the plasticizer system for PVA; in the dispersion process, the viscosity of the disperse system can not be increased since no PVA is added; and on the premise of considering the economy, the amount of the CNTs can be increased as many as possible, thereby better realizing the reinforcement effect.