The invention discloses a power communication analog telecontrol signal detecting device, comprising an external connector, a connecting wire and a telephone receiver, wherein the telephone receiver is connected with the external connector through the connecting wire, the external connector is a communication security unit, the connecting wire is used for conducting electrical energy, and the telephone receiver is an electroacoustic device that converts an audio electrical signal into an acoustic signal; during working, the external connector is inserted into an audio wiring module of a corresponding channel and is connected between an upper layer and a lower layer of the module, if signals exist in the channel, which means that weak current is led to the telephone receiver through the connecting wire, the telephone receiver converts the current into sounds, detectors prove that analog telecontrol signals have been received through the sound that is heard, which means that the communication channel is normal. The power communication analog telecontrol signal detecting device disclosed by the invention has the advantages of simple operation, fast detection and low cost.