High-temperature-resistant, high-strength, low-elasticity-modulus and high-density well cementation cement

The invention discloses high-temperature-resistant, high-strength, low-elastic-modulus and high-density well cementing cement, and relates to the technical field of well cementing materials in oil and gas development, and the high-temperature-resistant, high-strength, low-elastic-modulus and high-density well cementing cement comprises the following components by mass: 100 parts of oil well cement; 35-40 parts of a strength stabilizing material; 50 to 300 parts of a density regulator; 0.3 to 0.5 part of a high-strength toughening material; 0.8 to 1.5 parts of a flexible sealant; 0.2-0.4 part of a suspension stabilizer; 0.5-0.8 part of a dispersant; 2-3 parts of a fluid loss agent; 0.8 to 2.0 parts of a retarder; the oil well cement is mixed oil well cement of G-grade oil well cement and D-grade oil well cement in a mass ratio of 8: 2, and the high-strength toughening material is prepared by mixing modified carbon fibers, modified polyether-ether-ketone fibers, modified polyether sulfone fibers, beta-type sili