The invention discloses a novel building wall body with fire prevention, heat preservation and noise reduction. The novel building wall body comprises bearing wall bodies, wherein noise reduction layers are arranged on one side of the bearing wall bodies, and reinforcing ribs are arranged between the noise reduction layers and the bearing wall bodies. A fireproof layer is arranged on one side of the noise reduction layers, placing cavities are formed in the fireproof layer, accommodating grooves are formed on the outer wall of the fireproof layer, and reinforcing frames are arranged between the adjacent accommodating grooves. The accommodating grooves are internally provided with isolation membranes, the placing cavities are internally provided with water storage bags, the water storage bags are internally provided with cooling water, and limiting cavities are formed between the cooling water and the water storage bags. According to the novel building wall body, by arranging the fireproof layer, when a fire occurs, the isolation membranes and the water storage bags are cracked by heating, the cooling water is discharged from the placing cavities through the accommodating grooves, and the bearing wall bodies and the noise reduction layers are cooled and soaked, the spread speed of the fire is reduced and the time for people to escape from the scene of the fire is extended.