The invention discloses a gravel surface chemical slurry treatment device. The device comprises two conveying devices, a soaking box and a collecting box are arranged between the two conveying devices, and a supporting base is fixed to the lower end of the soaking box. Base plates are fixed to the two sides of the lower end of the supporting base, a conveying device is arranged at one side of thesoaking box, and a feeding hopper is arranged on the conveying device. The invention further provides a gravel surface chemical slurry treatment method. According to the invention, the cement is prepared into the slurry and is coated with the surface of acid stone, and a thin cement stone film is formed on the surface of the stone, and the stable chemical bonding with the surfaces of the stones isrealized; the set cement film is alkaline and has better adhesion with asphalt, the adhesion between the asphalt and set cement is improved, the mechanical properties of the original stones are not affected, the hidden danger that the performance of the mixture is affected due to falling of the set cement structure and the stones is reduced, the durability of the mixture is improved, the anti-stripping effect is enhanced, and meanwhile the performance of the mixture at the later period is not affected.