Ventilation safety monitoring device for coal mine

The utility model relates to the technical field of coal mine safety equipment, and discloses a ventilation safety monitoring device for a coal mine, which comprises an exhaust fan and a monitoring mechanism for detecting hydrogen sulfide gas, the outside of the exhaust fan is fixedly connected with a shell plate, the inner side of the shell plate is provided with a filter screen, the inner side of the shell plate is provided with a dismounting mechanism for replacing the filter screen, and the monitoring mechanism is fixedly connected with the exhaust fan. The top of the shell plate is provided with a cleaning mechanism used for cleaning the filter screen, the side, away from the exhaust fan, of the shell plate is provided with a protective grating, and by arranging the exhaust fan, the shell plate, the disassembling structure and the cleaning mechanism, a user can disassemble the filter screen through the disassembling mechanism in the using process; meanwhile, a user can directly clean the filter screen an