The invention discloses an early-strength emulsion for the cold regeneration of a waste asphalt pavement and a preparation method and application thereof. The raw material component of the early-strength emulsion for the cold regeneration of the waste asphalt pavement is prepared from the following components in percentage by weight: 50%-65% of road petroleum asphalt, 1.0%-4.5% of an asphalt emulsifying agent, 0%-10% of a modifying agent, 0%-0.4% of an exciting agent, 0.01%-0.4% of a dispersing agent, 0.05%-2.0% of a stabilizer, 0%-0.5% of an auxiliary agent and the balance of water, wherein the auxiliary agent is used for regulating the pH value, and the modifying agent is cationic styrene-butadiene latex. The early-strength emulsion for the cold regeneration can be used for reducing the blended water usage amount of a cold regeneration mixture and accelerating the hydration of cement contained in the cold regeneration mixture, thereby enhancing the early strength of the cold regeneration mixture, shortening the curing time and enlarging the application range of the emulsified asphalt cold regeneration mixture.