Abstract: The composites of organic hydrogen-absorbing materials and their catalysts using graphene oxide (GO) as a carrier have superior application prospects in the field of low-temperature vacuum. To investigate the effect of GO on the morphology and hydrogen absorption performance of the composites, Alkyne-PVA-(GO-PdO) was prepared, which was characterized by XRD, ¹H-NMR, SEM and TEM, and compared with thePdO@Alkyne-PVA. The results show that PdO and Aklyne-PVA are successfully loaded on GO. The PdO nanoparticles on Alkyne-PVA-(GO-PdO) are well-distributed, with an average particle size of 2.1 nm. Comparing the hydrogen absorption performance of two hydrogen-absorbing materials using static expansion method, it is found that the sorption amount of Alkyne-PVA-(GO-PdO) at the equilibrium pressure of 463.8 Pa is 11048.25 Pa·L/g, and the sorption amount of PdO@Alkyne-PVA at the equilibrium pressure of 560.21 Pa is 4528.35 Pa·L/g. This is attributed to the higher specific surface area of GO and the large number of oxygen-containing functional groups, defects and vacancies on the surface ameliorating the agglomeration problem of PdO nanoparticles. In addition, GO ensures that PdO nanoparticles would not hinder subsequent hydrogen absorption reactions due to the agglomeration phenomenon during the hydrogen absorption reaction, allowing the Pd to exert its optimal catalytic performance. The hydrogen overflow effect of GO accelerates the diffusion of dissociated hydrogen atoms, which effectively enhances the hydrogen-absorbing performance of the composites. It demonstrates that the well application potential of GO in the field of hydrogen absorption and provides a possibility for the implementation of hydrogen-absorbing materials based on GO.