Water spraying and moisture preserving device and moisture preserving method for large-volume concrete curing

The invention discloses a water spraying and moisturizing device for large-volume concrete curing and a moisturizing method. The water spraying and moisturizing device comprises a bottom plate, a push-pull frame is obliquely installed on the bottom plate, a supporting column is installed in the middle of the upper surface of the bottom plate, a lifting assembly is installed on the upper portion of the supporting column, a supporting cylinder is installed at the upper end of the lifting assembly, and a transverse plate is installed in the supporting cylinder in an inserted mode; a telescopic spraying rod is installed at the end of the transverse plate, a rotating shaft is rotatably installed on the supporting column, a winding disc is installed at one end of the rotating shaft, a rotating plate is installed at the other end of the rotating shaft, a locking piece is arranged on the upper portion of the rotating plate, and a positioning disc is connected to the rotating shaft in a sleeving mode. A lifting assemb