The liquid waste of hand made batik in Pekalongan City that is disposed of directly into the river will be harmful to aquatic biota and the surrounding environment. To overcome these problems, processing is required first. One of the faster processing to remove color and heavy metals is to use the electrolysis method. This study aims to determine the efficiency level of reducing dyestuffs, and heavy metals (Pb, and Cu). This research method is a laboratory experiment using electrocoagulation with variations in current voltage of 12 volts, 18 volts and 32 volts and contact times of 60, 120, and 180 minutes. This electrolysis process uses two aluminum plates as electrodes. The results of the analysis showed that the highest percentage of dye removal reached 95.43% with a contact time of 180 minutes with an electric voltage of 32 volts with a current of 5 Ampere. The percentage of heavy metal content of Pb ions showed a reduction of up to 84.41% with a contact time of 180 minutes with a voltage of 32 volts and a current of 5 amperes. For Cu metal ions at mains voltage, 18 and 32 volts with contact times of 120 and 180 minutes achieved a 100% reduction. The results of processing using the electrolysis method are able to reduce batik liquid waste below the quality standard according to the Minister of Environment Regulation No. 5 of 2004 and Central Java Regional Regulation No. 5 of 2012 Processing electrolysis systems with variations in high voltage and longer contact times can reduce color and metal ions weight in the processed batik liquid waste, but in its application it is better to pay attention to the use of electric voltage and current