Composition function agent for improving mechanical property of solid propellant, and solid propellant comprising composition function agent

The invention relates to a composition function agent for improving the mechanical property of a solid propellant, and the solid propellant comprising the composition function agent. The composition function agent is prepared from phenylamine and a stabilizer, wherein the percentage contents of the phenylamine and the stabilizer accounting for the total mass of the solid propellant are respectively 0.03 percent to 0.35 percent and 0.3 percent to 2 percent. By adopting the composition function agent prepared from the phenylamine and the stabilizer, an interface effect is improved, hydroxyl in the phenylamine can enter to a propellant network structure to adjust the network density of an adhesive, and meanwhile, a benzene ring in the phenylamine is of a rigid structure and can be beneficial to remarkably improving the strength and the modulus of the propellant when being used as a hard segment, so that the mechanical property of the high-energy solid propellant is improved; meanwhile, the high-efficient stabilizer is adopted, so that the suppression of the chemical compatibility of phenylamine composition function agent and nitric acid ester is improved, the decomposition of the nitric acid ester under a weak alkali condition is suppressed, and the function of further improving the mechanical property of the propellant is realized.