An embodiment of the invention discloses an embolic material composite and a preparation method thereof. The embolic material composite comprises polyethylene-vinyl alcohol, a degradable polymer, a contrast agent and dimethylsulfoxide. After the embolic composite is injected into an aneurysm cavity, the polyethylene-vinyl alcohol, the degradable polymer and the contrast agent are precipitated and solidified along with the diffusion of dimethylsulfoxide in blood so that an embolism body is formed, thereby achieving the aim of embolizing the aneurysm. Additionally, the embolism body forms a porous structure because of the gradual degradation of the degradable polymer, so the mass of the embolism body is greatly reduced. Therefore, the embolic material composite can reduce the total mass of the embolism body via the gradual degradation of the degradable polymer, thereby relieving the occupied effect effectively. Furthermore, the finally formed porous structure is in favor of being effectively adhered with endothelial cells, promoting cell differentiation and proliferating and quickening the endothelialization of vessels, and effectively preventing the possible blood recirculation after the embolizing.