▎ 摘　　要

NOVELTY - Preparation of composite absorbing material involves taking sodium hydroxide solution, dividing in two parts, adding sodium aluminate, stirring, adding graphene to first sodium hydroxide solution, performing ultrasonic dispersion to obtain solution A, adding sodium metasilicate to second sodium hydroxide solution, stirring, adding graphene, performing ultrasonic dispersion to obtain solution B, mixing solutions A and B to obtain thick gel, agitating, curing for 20 hours and freeze-drying. The mass ratio of sodium metasilicate, sodium metaaluminate and sodium hydroxide is 1.24:1:3.66. USE - Method for preparing composite absorbing material (claimed). ADVANTAGE - The composite absorbing material is convenient to use, and has low density, good wave absorbing performance and low raw material cost. It covers wide frequency range.