Underground harmful gas monitoring system

The utility model discloses an underground harmful gas monitoring system, which comprises a plurality of monitoring points, the plurality of monitoring points are connected with an information transfer end, the information transfer end is connected with a monitoring end, each monitoring point comprises an information acquisition device, the information acquisition device comprises a device body, and the device body is connected with the information transfer end. One side of the device body is provided with a plurality of data connection ports, a control processing unit is fixedly arranged in the device body, the plurality of data connection ports are all connected with the control processing unit, the control processing unit is connected with a Wifi unit and a zigbee unit, a UWB electronic tag is pasted on the shell, and the UWB electronic tag is connected with the control processing unit. The information transfer terminal comprises a router and a UWB base station, the Wifi unit, the zigbee unit and the UWB b