Concrete densification-enhancing and temperature-adjusting type anti-cracking agent and preparation method thereof

The invention discloses a concrete densification-enhancing and temperature-adjusting type anti-cracking agent and a preparation method thereof. The anti-cracking agent comprises the following components in percentage by mass: 40%-50% of a modified calcium-magnesium composite expanding agent, 40%-50% of a superfine mineral admixture, 3%-7% of sodium methyl silicate, 1%-5% of modified starch ether, 1%-4% of sorbitol and 1%-3% of a naphthalene sulfonate formaldehyde condensate. Through the synergistic effect of the micro-expansion material, the micropore filling material, the plastic water retention material and the hydration heat inhibition material, the compactness and the later strength of the concrete can be effectively improved, the shrinkage of the concrete in the temperature drop stage can be compensated, and the hydration heat release process of the concrete can be adjusted, so that the effects of enhancing, compacting and cracking resistance of the concrete can be realized. The material overcomes the de