Downhole gas real-time monitoring system

The utility model discloses a downhole gas real-time monitoring system which comprises a downhole gas monitoring system (1) and a ground main control system (2). The downhole gas monitoring system (1) comprises a gas density sensor (11), an excessive gas audible and visual alarm (12), a data communication module (13) and a power module (14) used for supplying power to other modules. The ground main control system (2) comprises a ground monitor (21) and a data receiver (22). The ground monitor (21) is provided with communication ports (23) and is connected with ventilation equipment and a power unit. By adopting the manner of downhole collecting and monitoring at the ground, the downhole gas real-time monitoring system can collect and monitors the data downhole at real time, and send the collected data to the ground monitor timely, thus helping the ground workers know the gas density downhole at real time and take the measures of ventilating or pumping to keep the gas density within the safe value. Meanwhile, in the case of the emergency of excessive gas density downhole, devices such as the fan and the power source can be directly controlled through the communication ports.