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This invention discloses a dual-effect concrete internal curing agent that combines shrinkage resistance and reinforcement, and its preparation method. Belonging to the field of building materials technology, the internal curing agent is composed of 100 parts phosphoric acid, 100 parts calcium hydroxide, 15-30 parts anionic or nonionic polyacrylamide, 20-30 parts sodium polyacrylate, 20-40 parts maleic anhydride (MA), 20-40 parts hydroxypropyl methylcellulose, 50 parts amorphous nano-silica particles with an average particle size of 20-50 nm, 5 parts defoamer, and 800 parts deionized water. In preparation, calcium hydroxide is first dissolved in water, then phosphoric acid is added and reacted at 60-80℃ until the pH value reaches 5.5-6.5. Then, nano-silica particles are added sequentially for dispersion, followed by HPMC and PAM, and stirring to obtain the final product. This invention effectively inhibits concrete shrinkage through the synergistic effect of organic polymers, inorganic minerals, and nanomaterials. The 60-day drying shrinkage rate is reduced by up to 77.25%, and the compressive strength is increased by 9.57%. As a water-based preparation, it can be directly incorporated into concrete and is suitable for natural curing in high-altitude and plateau regions.