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The invention discloses a soil site dewatering and drainage method for protecting an archaeological site in humid environment. The method comprises the following steps that 1, 1.0m is outwards expanded at the explored peripheral side line of a region requiring archaeological excavation for forming an original state soil separation wall; 2, a sand filling water guide drainage ditch is dug around the separation wall, and a water guide passage easy to underground water flow seepage is formed; 3, the sand filling water guide drainage ditch is provided with a water extraction well; 4, water in the water collecting well is dredged in time. The soil site dewatering and drainage method aims at solving the problem of underground water discharge difficulty in the archaeological site in the cohesive soil region, and adopts a method of building the manual sand filling water guide drainage ditch on the periphery of the archaeological exploration part and building a water collecting well in the sand filling drainage ditch. In-site simulation experiments prove that the method has the advantages that underground water in cohesive soil can be discharged, and in addition, the capillary water movement can be blocked, so that the underground water level can be effectively controlled, the archaeological exploration part water seepage is prevented and controlled, and the smooth proceeding of the archaeological work is ensured. The method can also be used for protecting the archaeological site in humid environment shallow underground-water-bearing regions and preventing and controlling the water seepage in an exhibition hall. The goals of controlling the underground water around the archaeological site regions and preventing and controlling the seepage of the underground water into archaeological pits are achieved.