The invention discloses a preparation process of a PVC foaming material for a sports shockproof pad. The preparation process is characterized in that ethanol amine and 1,2,4-benzenetricarboxylic anhydride are used as raw materials, p-toluenesulfonic acid is used as a catalyst, hyperbranched polyamide ester is prepared in polyvinyl chloride paste resin, a foaming agent, a plasticizer, a stabilizerand an anti-tearing agent are added, the obtained mixture is mixed to prepare paste, and the paste is subjected to compression molding and foaming, so that the PVC foaming material is prepared. The PVC material prepared according to the preparation process has good flexibility, toughness and tear resistance.