Environment-friendly filler prepared from waste cellulose acetate fibers as well as preparation method and application of environment-friendly filler

The invention discloses an environment-friendly filler prepared from waste cellulose acetate fibers, a preparation method and application, the filler is prepared by mixing a cementing material, water, the waste cellulose acetate fibers and a fluid-solid phase change agent, the water and the waste cellulose acetate fibers are mixed to obtain a mixture A, then the water and the cementing material are mixed to obtain a mixture B, and the mixture B is mixed to obtain a mixture B; the mixture A and the mixture B are mixed and stirred and then mixed with a fluid-solid phase change agent, and the environment-friendly filler is obtained; the prepared environment-friendly filling material is used for filling a large-space goaf; the raw materials are green and environment-friendly and wide in source, the prepared environment-friendly filler is not segregated in fluid and solid phases and good in water-retaining property, and the problems that in the prior art, the usage amount of waste cellulose acetate fibers is small