A dam body joint circulation grouting method comprises slurry inlet pipes, slurry return pipes and exhausting pipes, wherein the slurry inlet pipes, the slurry return pipes, the exhausting pipes, a stirring barrel and a grouting pump are connected into a circulation loop, each slurry pipe, each slurry return pipe and each exhausting form a set of grouting assembly, and two sets of grouting assemblies are arranged in each grouting area. Drainage detection is conducted to the grouting assemblies in each grouting area, after the drainage detection is completed, one slurry inlet pipe which is relatively good in flowing performance is selected from the two sets of grouting assemblies of each grouting area to be connected with the grouting pump and provided with a valve and a pressure gauge, and other five pipes are connected with the stirring barrel for slurry return. After grouting is started, normal position secondary configuration is conducted to slurry returning to the stirring barrel, the required slurry water cement ratio is configured, and the slurry is grouted into dam body joints from the stirring barrel to form circulation grouting. The dam body joint circulation grouting method changes a traditional method of interval blowing type joint grouting, and reduces probability of joint surface blocking and pipe accidents.