Abstract: In order to comprehensively evaluate the construction waste coarse fly ash filling materials and reflect the environmental impact of construction waste coarse fly ash filling materials, the material-element analysis method is used to evaluate the environmental friendliness of construction waste coarse fly ash. Through the establishment of a comprehensive evaluation system for environmental friendliness and the determination of the level of environmental friendliness, it is necessary to explore whether the filling materials can make the maximum use of fly ash and construction waste on the basis of satisfying their filling properties. The results show that the construction waste coarse fly ash filling material can not only meet the needs of underground filling, but also is environmentally friendly, with high practical value and development prospects.