In the material processing industry there are several processes for processing materials from raw materials into finished materials that are ready to be marketed. Among the many processing processes, there is a material mixing process that functions to mix the material processed from raw material into a search material which is then mixed with other ingredients to produce a mixture or ingredients that are in accordance with the wishes of the industry. Parts of the material mixing process need appropriate systems, grooves and tools so that the mixing process runs well. Based on this description, an automatic preblend tank and prototype tank system consists of Flow Meters, Selenoid Valves, pumps, stirring motors, and then the data will be processed by Arduino Uno. Preblend tank automatic system is a system for the mixing process that has an automatic system that can turn on and turn off the valve so that filling from the material tank can be carried out alternately, turning off the pump after the passing material has reached the limit, starting the stirring motor with the speed and torque that has been set, turning off and reset all components after all processes have run. This preblend tank automatic system will be able to produce the transfer process along with the mixing of materials with an automatic system which can later be applied in industries both large scale and home industries.