The invention relates to the technical field of automobile tire protection material manufacture, in particular to a bulk density (BD)-free radical silicon molecule polymeric material capable of adapting to tire self repair and a production method of the BD-free radical silicon molecule polymeric material. The free radical silicon molecule polymeric material is characterized by comprising styrene-isoprene segmented copolymers, maleated rosin, engine oil, antioxidant additives and organic silicon additives. The material preparation process comprises the following steps that: raw materials are proportionally mixed and are then put into a reaction kettle, the temperature is raised, the pressurization is carried out, the materials are sufficiently stirred, the temperature is lowered, and the materials are discharged. Compared with the prior art, the free radical silicon molecule polymeric material provided by the invention can be used in a temperature range being 0 to 20 DEG C, the regional disparity does not exist in the use process, the physical and chemical properties are stable, after the free radical silicon molecule polymeric material is coated on the tire, the tire can realize the self repair after being pierced, the tire repair and the tire replacement are not needed, the tire also has the functions of noise reduction, shock absorption, energy saving, blasting prevention and leakage prevention, the temperature inside the temperature is reduced, and the service life of the tire is prolonged.