Cooling fan control circuit of talk back equipment, walkie talkie power line and talk back equipment

The invention provides a cooling fan control circuit of talk back equipment, a walkie talkie power line and the talk back equipment. The cooling fan control circuit comprises a power input end, a signal generation circuit, a main control circuit, a driving circuit and a cooling fan interface, and the power input end provides a power source for the signal generation circuit, the main control circuit, the driving circuit and the cooling fan interface; the signal generation circuit comprises a comparator, the first input end of the comparator and the second input end of the comparator are both electrically connected with the power input end, the first input end of the comparator is connected with a first capacitor in parallel, and the output end of the comparator is electrically connected with the main control circuit; and the main control circuit is electrically connected with the driving circuit, and the driving circuit is electrically connected with the cooling fan interface. The walkie talkie power line uses