Abstract: Based on the anti-explosion standards and technical criterion for diesel vehicles, an intelligent explo? sion-proof device for construction machinery used in gas-rich tunnels was designed to address the problems with modification of construction machinery. The device forces the vehicle to flameout, turn off and lock when the tunnel gas concentration is at or above the allowed maximum concentration. To prevent gas explosions, the device begins to spray when the temperature of the exhaust system is at or above the allowed maximum temperature. Three shutting systems for equipment failure, abnormal water level and exceeding the maximum temperature were designed for the air exhaust system to improve device reliability. Practice indicates that the intelligent explosion- proof device is characterized by rapid installation, easy use and safe operation.