The invention relates to the technical field of constructional engineering equipment, and discloses a concrete spraying machine for constructional engineering. The machine comprises a nozzle sleeve, an inner spiral pipe is arranged in the nozzle sleeve, a water pressure connector and an accelerator connector are fixedly mounted on the top and the bottom of one side of the outer portion of the nozzle sleeve correspondingly, and a normal contact block is arranged at the position, between a limiting contact block I and a limiting contact block II, of the middle of the outer surface of the nozzlesleeve. According to the concrete spraying machine for constructional engineering, through the inner spiral plate, a horn mouth in the nozzle sleeve and a turbulent flow board, concrete burdens, waterand an accelerator are sufficiently mixed and stirred, meanwhile, during spraying, the horn mouth and the turbulent flow board are used for evenly and effectively spraying the concrete mixture to therock mass, compared with an existing concrete spraying machine nozzle, the mixing uniformity is good, the dust generation is effectively reduced, and meanwhile, the quality after concrete spraying isimproved.