A terminal block for coupling with at least one conductive wire includes an insulation base (100) and a circuit board (200). A docking chamber (101) is defined in the insulation base (100), multiple connecting holes (102) for inserting the respective conductive wires and multiple through holes (103) corresponding to the respective connecting holes (102) are defined on a lateral surface of the insulation base (100). The respective through holes (103) are communicated with the docking chamber (101) and adjacent to the respective corresponding connecting holes (102). The circuit board (200) is arranged in the docking chamber (101), and multiple LEDs (210) are arranged on the circuit board (200) corresponding to the respective through holes (103). The LEDs (210) are accommodated in the docking chamber (101), and the respective LEDs (210) are able to illuminate through the respective corresponding through holes (103).