▎ 摘　　要

NOVELTY - Preparation of allantoin using titanium dioxide-based composite solid catalyst comprises mixing tetrabutyl titanate, graphene, dimethylformamide and ethanol to form solution A, mixing water, ethanol and acetic acid to form solution B, mixing copper salt, zinc salt, silver salt, water and ethanol to form solution C, adding dropwise solution B and solution C to solution A, heating, drying, grinding to obtain powder, calcining to obtain titanium dioxide-based composite solid catalyst, soaking with zinc chloride and niobium pentachloride in hydrochloric acid, drying, oxidizing glyoxal and nitric acid to obtain glyoxylic acid, and performing condensation reaction of glyoxylic acid, urea and titanium dioxide-based compound/Lewis acid compound. USE - Method for preparing allantoin using titanium dioxide-based composite solid catalyst. ADVANTAGE - The method has excellent yield.