U-shaped cavity rotor type concrete spraying machine for dry spraying and wet spraying

The invention discloses a U-shaped cavity rotor type concrete spraying machine for dry spraying and wet spraying. The concrete spraying machine comprises a storage unit, wherein the storage unit is connected with a charging unit; a spraying unit is arranged at a lower part of the charging unit; a U-shaped cavity is formed in the spraying unit and is rotatably connected with a discharging unit; the discharging unit is provided with a liquid accelerating agent supply pump. The concrete spraying machine has the advantages that the structure is simple; during dry spraying, powder accelerating agents are quantitatively added to a powder accelerating agent stock bin above a charging machine, the powder accelerating agents and concrete mixes are transported to a sprayer for watering together, and a mixture is sprayed to a sprayed surface; during wet spraying, liquid accelerating agents are mixed with wet concrete at the sprayer via a supply pump, the mixture is sprayed to the sprayed surface, thus dry spraying and w