The present invention relates to a silicone rubber reinforced and cross-linked based on POSS, and a preparation method thereof. According to the concrete preparation method, cyclic carbonate containing vinyl and octa polyhedral oligomeric(mercaptopropyl) silsesquioxane (SH-POSS) are subjected to a thiol-ene reaction to synthesize cyclic carbonate modified POSS as a reinforcing filler, alpha,omega-aminoalkylpolysiloxane is used as a base glue, and the cyclic carbonate group on the POSS and the amino group in the base glue are subjected to a reaction to form a cross-linked curing center so as toprepare the room temperature or high temperature silicon sulfide rubber. According to the present invention, the problems that the inorganic particles are easy to agglomerate and the interaction force at the organic / inorganic two-phase interface is weak during the traditional reinforcing can be avoided, the problems caused by the use of the catalyst during the vulcanization can be avoided, the silicone rubber preparation process is simplified, and the production process and the product have characteristics of safety, energy saving, environmental protection, strong practicality and easy promotion, and have great application potential in the fields of aerospace, electrical and electronic, light industry, chemical industry, textile, machinery, building, transportation, national defense, energy sources, medicine and medical treatment, agriculture and the like.