Detection device for serial port line

The utility model provides a detection device for a serial port line, which comprises a box body, joints and a detection circuit. The detection circuit is arranged in the box body. The input end of the detection circuit is connected with the joints. The output end of the detection circuit is in the form of a light-emitting diode. The light-emitting diode is arranged on the upper surface of the box body. The joints comprise a first joint and a second joint. The first joint is used for being connected with one end of a to-be-detected serial port line. The second joint is used for being connected with the other end of the to-be-detected serial port line. The detection circuit is used for detecting the line sequence and the on/off state of the serial port line, and then displaying the detection result through the light-emitting diode. According to the technical scheme of the utility model, the connection states of corresponding pins at the two ends of the serial port line and the line sequence of the serial port line can be quickly and accurately detected.