In this paper, an indoor air cleaner for a non-toxic room by electrostatic technique was designed, developed and tested. The cleaner prototype consists of a particle charger, a particle collector, an ionizer, a fan, a speed controller, a timer and a high voltage power supply. In this system, a fan draws a sample air into the system through a wire-to-plate particle charger to set a charge on the particulate. After the particle charger, the charged particulates then enter the multiple-tube particle collector that consist multiple-tubes and corona discharge electrodes. In the collector, the discharge electrodes are high voltage power supply, while the multiple-tube is grounded. The corona discharge field inside the collector will be caused around the discharge electrodes. When charged particulates flow into the collector to collect and deposit with the electrostatic force on the inner walls of the outer tube and the air without particulate then passes out through a ionizer to discharge air to the charge neutrality to improve the clean air quality. The developed prototype will be effective in the removal of particulate up to 99% at the time of treatment for 70 minutes.