Device for water purification and sterilization in two stages: the first stage uses infrared lasers to convert water into steam condenses on polished metal surface and gathered in a half cylinder, which has a valve and speed sensor to control the speed of water flow to the second stage. In second stage, water is exposed to UV laser radiation. Water gets rid of suspended solids and salts in the first stage, while it disinfected and cleaned from bacteria and organic material in the second stage. The device is characterized by easy maintenance. It does not cause any color or taste change of water, it has ability of automation control, and the possibility of installing directly on the water source.