The invention discloses a grid air suction device which comprises a shell, a grid assembly and a spreading plate. The shell comprises a bottom plate and a peripheral wall plate arranged on the periphery of the bottom plate and extending upwards, the bottom plate is provided with an air sucking port, the grid assembly is arranged in the shell, the lower surface of the grid assembly and the upper surface of the bottom plate are separated so that a first air suction cavity is defined between the lower surface of the grid assembly and the upper surface of the bottom plate, and the first air suction cavity is communicated with the air sucking port. The spreading plate is arranged on the grid assembly so that a plurality of second air suction cavities can be defined between the spreading plate and the grid assembly, the second air suction cavities are communicated with the first air suction cavity below through first through holes penetrating through the grid assembly, and the spreading plate is provided with multiple second through holes communicated with the second air suction cavities. The adsorption force of the grid air suction device is larger, and accordingly printed matter can be better laid and attached onto the spreading plate of the grid air suction device.