Wireless gas alarm device

A wireless gas alarm device comprises a sensor, an audible-visual alarm module, a master controller, a digital-analog conversion module, a power supply, a wireless transmitting module, a wireless receiving module, an exhaust controller, a motor driver and a motor, wherein the digital-analog conversion module circularly acquires analog quantity detected by the sensor and converts the analog quantity into digital quantity, the digital quantity is transmitted to the master controller, the master controller processes and determines the digital signals, the master controller controls the audible-visual alarm module to give out audible-visual warnings when an optional sensor detects the gas concentration exceeding a set alarm threshold, and transmits control commands to the exhaust controller through the wireless transmitting module and the wireless receding module, and the exhaust controller controls the motor driver to drive the motor to drive a fan in operation.