The invention relates to a method for improving the adsorption capacity of a latex wastewater extract. The method is characterized by comprising the following steps of removing suspended matter from water-based latex production wastewater, uniformly mixing the wastewater, adding high-valence metal ions, and conducting stirring for a reaction for 5-30 minutes to form an insoluble solid latex particle extract; separating out the extract; dehydrating and crushing the extract; drying the extract at the low temperature to form a porous extract; heating the dried latex particle extract to 600-800 DEG C at a heating rate of 10 DEG C/min under the protection of N2, carbonizing the extract for 1-4 hours, cooling the extract to the room temperature, taking out the extract, and crushing the extract into granules in the size of 100-200 mesh; dissolving out the high-valence metal ions in an acid solution with the concentration of 0.5<-1> mol/L, then conducting washing with water to remove the high-valence metal ions until a washing solution is neutral, and conducting filtering and drying to obtain a final product. In this way, the adsorption capacity is increased.