▎ 摘　　要

NOVELTY - Preparing titanium dioxide-based composite solid catalyst comprises (i) mixing tetrabutyl titanate, graphene, dimethylformamide and ethanol to form solution A; (ii) mixing water, ethanol and acetic acid to form solution B; (iii) mixing copper salt, zinc salt, silver salt, water, ethanol to form solution C; (iv) adding solution B and solution C simultaneously dropwise to solution A, and allowing to stand, drying and grinding to obtain powder substance; and (v) calcining powder substance. USE - The method is useful for preparing titanium dioxide-based composite solid catalyst useful for preparing allantoin. ADVANTAGE - The method is simple in process and titanium dioxide-based composite solid catalyst has good catalytic effect on the synthesis of allantoin. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for titanium dioxide based composite solid catalyst prepared by above mentioned method.