The invention discloses a fire-fighting power supply wireless monitoring device which is provided with a main monitoring machine (1), at least one power supply collector (3) and at least one repeater (2), wherein the main monitoring machine (1) has functions of wireless receiving, intelligentized alarm message display, intelligent storage, and the like; the repeater (2) has a wireless data receiving and transmitting function, can increase the communication transmission distance and enhance the up and down transmission between the main monitoring machine (1) and the power supply collectors (3), in addition to uploading the alarm and work state information of all the power supply collectors (3) inside an own area to the main monitoring machine (1), the alarm information of the repeaters (2) is also uploaded to the main monitoring machine (1). The invention has the advantages of flexible construction, convenient installation and debugging, small construction amount, greatly shortened construction period, convenient maintenance, reduced maintaining cost, simple operation, simple and convenient installation, high sensitivity, safety and reliability.