The invention relates to an integrated removing device for carbon dioxide and tiny particulate matter in mariculture, and belongs to the technical field of aquaculture equipment. The integrated removing device is a cylindrical groove body and is provided with a pollution discharge section, an air distribution section, a water inlet section, a padding section and a foam collection section sequentially from bottom to top. According to the integrated removing device, a fan supplies air to the air distribution section, and bubbles are formed in water and form contact reaction with inlet water flow. Due to the fact that the concentration of the carbon dioxide in aquatic water is much higher than that in air, according to the dual mode theory of gas-liquid transferring, the carbon dioxide is transferred from the liquid phase to the gas phase, and the degassing effect is generated. Due to the effect of the surface tension of sea water, the tiny suspended particulate matter, organic matter, grease and the like can adhere to a lot of the tiny bubbles formed by the integrated removing device well. Foam carrying the pollutants can be separated from the water and accumulates on the water surface along with ascent of the bubbles, and therefore when the foam is removed, the pollutants adhering to the foam are removed.