Signal strength display device for wireless Hub, which is disposed on a mother unit or daughter unit of the wireless Hub. The signal strength display device includes: a wireless transceiver circuit; a signal analyzing unit connected to the output terminal of said wireless transceiver circuit for calculating and analyzing the strength of the radio signal received by said wireless transceiver circuit to generate a corresponding value; an analog-to-digital converting unit connected with said signal analyzing unit for converting the value generated by said signal analyzing unit into digital data; and a display unit disposed on the housing of the wireless Hub for displaying the number of all the connected daughter units, the average value of the signal strength of all the connected daughter units or the value of signal strength of a certain daughter unit.