An indicating circuit of network state includes a core board and an indicating lamp circuit, in which, the core board includes a signal output unit set with an output end of network speed signals andan output end of network connection state signals, the indicating lamp circuit includes two display branches, the core board also includes a signal conversion circuit including a first transistor, a second transistor and a third transistor, in which, the base of the first is connected with the output end of the network connection state signal on the signal output unit, the emission pole is connected with the output of the speed signal on the output unit, the base of the second transistor is connected with the output of the network speed signal, the emission pole is connected to the supply, thecollector is connected to the emission pole of the third one, the base of which is connected with the base of the first transistor, and the collectors of the first and third ones are connected with the two display branches of the indicating lamp circuit separately.