The invention discloses a detection device and a detection method for a cable status of a
transponder. The detection device is connected onto the output end of the
transponder connected with a trackside
electronic unit. The detection device comprises an acquisition module and a
phase discrimination module, wherein the acquisition module is used for acquiring the
voltage and the current of the output end of the trackside
electronic unit; the
phase discrimination module is used for comparing the phase of the acquired
voltage with the phase of the acquired current; if the phase of the
voltage is in advance of the phase of the current, a cable of the
transponder is judged to be short-circuited; if the phase of the current is in advance of the phase of the voltage, whether the
phase difference between the current and the voltage is less than or equal to a preset threshold value or not is judged; if the
phase difference between the current and the voltage is less than or equal to the preset threshold value, the cable of the transponder is judged to be open-circuited; and if the
phase difference between the current and the voltage is not less than or equal to the preset threshold value, the cable of the transponder is judged to be normal. According to the detection device for the cable status of the transponder, the cable status can be detected under the condition of long distance, and the open-circuited status, the short-circuited status and the normal status are correctly distinguished.