The invention relates to a cooling, moisturizing and grouting integrated device and method for mass concrete. The device comprises an air refrigerator, an atomizer and a cold air pipeline. The cold air pipeline comprises an air inlet pipe, an air outlet pipe and a cold air buried pipe pre-buried in concrete. The cold air buried pipe comprises a cold air main pipe, cold air branch pipes and cold air branch pipes. A pressurizing device and a pressure gauge are arranged on the air inlet pipe, and the air inlet pipe is connected with the low-temperature atomization channel and the superfine cementpaste grouting channel through a three-way pipe; the air outlet pipe is connected with the recovery tank; the two sides of the pipeline of each cold air branch pipe are connected with a plurality ofcold air branch pipes, and a plurality of vent holes are formed in the cold air branch pipes. According to the integrated device, the interior of concrete can be subjected to cooling and moisturizingmaintenance at the same time, the internal stress is greatly reduced, temperature shrinkage and drying shrinkage are reduced, and cracks are reduced; and grouting treatment can be performed to repaircracks in concrete.