The invention provides an electrical fire monitoring device, which comprises a first thermometer arranged on a main trunk wire, a second thermometer arranged on a branch wire, an alarm device and a control unit, wherein the control unit is in communication connection with the first thermometer and the second thermometer and used for acquiring a first temperature of the main trunk wire and a second temperature of the branch wire, and the control unit is set to control the alarm device to give out an alarm signal indicating overheating of the branch wire when a difference value of the first temperature and the second temperature is greater than a first temperature threshold. The electrical fire monitoring device is novel in structure, perfect in function, safe and reliable, can detect electric leakage conveniently, effectively prevents occurrence of a fire, and is convenient to install and use.