There are some technique that utilized for wastewater treatment, electrocoagulation (EC) is one of them. This method is useful for wastewater treatment, which has heavy metals (lead compounds) as contaminants. Computational Fluid Dynamics (CFD) modeling was utilized to simulate the batch (EC) unit in this study. To model species transport, current-voltage distribution, and fluid movement, the diffusion, Nernst-Planck, and Navier-Stokes formulas have been employed. The system of formulas that governs this issue has been solved utilizing commercial software (COMSOL 5.4). Three main variables that impacted the performance of the lead EC process were tested: different starting lead amounts (200, 300, 400, 500 ppm), various applied voltage (2.5,5 V), and various anode rotating velocities (50,100, and 150rpm). The removing rates of lead (removing effectiveness) reduced as the original lead level increased, according to the findings. And removing efficacy, which improved with increasing applied voltage, but not with increased rotational anode velocity, which climbed from 50 to 100 rpm before beginning to drop at 150 rpm. Since the instability of the produced flocks, the eliminating effectiveness progressively decreases. Utilizing (Al/St.St) electrodes, the best removal efficacy has been obtained at 200ppm, 5 volts, and 100rpm rotating velocity.