The utility model discloses a computer network monitoring devices, which comprises a mainboard body, mainboard body right -hand member face is provided with the gomphosis groove, the left end head that gomphosis inslot side lower extreme level was provided with the subplate body and the subplate body passes through the bottom that hinged joint the gomphosis groove, subplate body up end right -handmember rigid coupling has the iron plate, the level is provided with the guard plate under the subplate body, the internal portion's right -hand member of subplate is provided with wireless network signal reception device. The utility model discloses be provided with the waistband on the mainboard body, be convenient for connect whole device at the waist, then open in the subplate trunk circlingof the gomphosis inslot of the mainboard body gomphosis to horizontal position, as the time measuring that examines who carries out wireless network signal, it transmits the device for network detection to accept radio signal by wireless network signal reception device, carry out the detection of network signal intensity state, then with the data display that detects on the display screen of subplate body up end, use the oil pike to write on the glass blackboard of subplate body up end left side setting by measurement personnel.