Recent literature has demonstrated that on a laboratory scale photocatalysis technology to destroy organic pollutants completely present in water has got great potential. In this paper, a new reactor design simulation of reactor (considering thermal analysis) has been carried out using SolidWorks software. The SolidWorks CAD software is a mechanical design automation application that lets designers quickly sketch out ideas, experiment with features and dimensions, and produce models, simulation and detailed drawings. The operating condition of reactor i.e temperature (min. 25°C and max. 80°C) and 1 atm. pressure. As result shows that, the design of reactor is feasible. A reactor was designed and constructed based on the modelling results, and when experiments were conducted showed very promising results. The new reactor aims at developing a technical solution to the design of a commercial scale photocatalytic reactor.