Research on bio-activated carbon wastewater treatment material prepared from Macadamia shells using KOH activating agent at the rate of 1KOH: 1 piece of activated carbon is carried out through influencing factors of temperature and time. The research result of Methylene blue (MB) absorption ability at respectively optimal temperature and time of 200oC and 60 minutes of activated carbon shows that 1g of activated carbon will absorb 91,50mg of Methylene Blue. The result shows that the color treating efficiency of the Methylene Blue (MB) is 83,41% corresponding to the color level reduced from 349.67 Pt-Co to 58 Pt-Co. Research result shows that bioactive carbon prepared from Macadamia shells and activated from KOH can treat color in dyeing textile wastewater.