Abstract: Addressing the dry and hot summer climate in Xinjiang and the shortage of air conditioning equipment in university dormitories, this design utilizes evaporative cooling principles and microcontroller-based control technology to develop a compact evaporative air cooler suitable for dormitory environments in Xinjiang. The system employs an AT89C52 as the main controller, utilizes a DHT11 humidity sensor for real-time environmental parameter monitoring, and implements water circulation and airflow speed regulation through pump control and fan drive modules. Operational status is displayed in real time via an OLED screen. The system features three operating modes (low, standard, and high), three-speed airflow adjustment, and low-water protection, effectively lowering ambient temperature while increasing humidity to enhance dormitory comfort. Test results indicate that under typical Xinjiang summer conditions, this device can lower ambient temperature by 5-8°C while increasing relative humidity by 15-25%, meeting dormitory cooling requirements with energy-saving, environmentally friendly, and cost-effective advantages.