Coal mining is one of the industries that makes many contributions to the national economy. However, this industry also has many negative impacts on the environment, especially in areas: mining, processing, storing and transporting coal. Although coal mining companies use dust suppression methods such as the use of high pressure water jets, or fixed sprinkler or misting systems. However, they do not suppress dust frequently can affect to coal quality due to consume too much water. Besides, coal mines can not real-time monitor dust density in the air, also affect to the health of workers as well as reduces the life of machinery and equipment. Therefore, the design and implementation of an automatic coal dust suppression and monitoring system is essential for coal mining industry in Vietnam. This article proposes an automatic dust suppression system for coal processing area based on IoT technology. The system allows real-time monitoring of dust density, warning when exceeding the allowable threshold, automatically turning on/off the mist spraying system according to the measured dust density to ensure safe working conditions for workers as well as the life of machinery and equipment increased.