Rubber composition and preparation method thereof and semi-steel radial tire

The application discloses a rubber composition and a preparation method thereof and a semi-steel radial tire. The rubber composition comprises the following ingredients: a matrix pure rubber, carbon nanotube, a reinforcing filler, a silane coupling agent, a plasticizer, an antioxidant, an activator, a promoter, a vulcanizing agent and the like. The invention has the following advantages: good processability of tread rubber production process is maintained, and tire's grip strength of dry lands and wetlands is raised. That is to say, braking distance is shortened, and control performance is enhanced.