The invention relates to a high-intensity high-percentage elongation solid propellant, which comprises the following components by mass percentage: 8.0-10.0% of an adhesive and a curing agent; 1-5% of a plasticizer, 69-77% of AP, 10-18% of a fuel, 1.0-1.5% of a network conditioning agent, and 0.2-0.6% of a strengthening agent. Through the optimization design on a formula, and reasonable matching of the network conditioning agent, usage of the novel strengthening agent, and a surface coating method of AP or addition of a burning rate regulator, the maximum tensile strength of the propellant under pulling rate condition of 100 mm/s at the temperature of 20 DEG C is greater than 3 MPa, the maximum percentage elongation is greater than 29%, the static state burning-rate at 6.86 MPa can be adjusted in a scope of 4.0-30 mm/s, vacuum specific impulse at 6.86 MPa is higher than 2768.1 N.s/kg, the energy of the propellant can be kept at a high level, and the propellant has excellent mechanical property, and satisfy the requirements of novel strategy and atactical missile motors.