The invention relates to an apparatus for automatically detecting insulating properties of an
electric power transmission line. The apparatus is characterized by including an apparatus main body, a walking module, a measuring module, an outer expansion module, a secondary opening module, a power supply module, a control module and a
wireless communication module. The control module, the power supply module, and the
wireless communication module are mounted inside the apparatus main body. The power supply module and the other modules are connected so as to supply power to the other modules. The control module is connected to the walking module, the measuring module, the outer expansion module, the secondary opening module, and the
wireless communication module so as to realize detection
control function. According to the invention, the apparatus main body is moving on the
electric power transmission line, and a temperature sensor and an
electric field sensor are used individually for collecting temperature values and
electric field intensity values at different positions of the
electric power transmission line, and malfunction points are determined by the temperature values and the
electric field intensity values in combination with a counter on a
drive wheel. The apparatus of the invention guarantees timeliness of detection of the insulating properties of the
electric power transmission line, effectively prevents unnecessary trouble brought by current method of artificial detection, and substantially increases detection efficiency.