Disclosed is an SOMCL-9112 solid dispersion. The SOMCL-9112 solid dispersion is characterized by being prepared from the following raw materials in percentage by weight: 5 percent to 60 percent of SOMCL-9112, 5 percent to 90 percent of pharmaceutically acceptable matrix polymer, 0 percent to 20 percent of surfactant, 0 percent to 20 percent of flow aid and 0 percent to 20 percent of plasticizer. Also disclosed are a preparation method of the SOMCL-9112 solid dispersion, a solid medicinal preparation containing the solid dispersion and application of the solid dispersion for preparing a medicine for treating cancer.