The invention discloses an overhead rail type firefighting inspection robot system. The overhead rail type firefighting inspection robot system comprises an overhead rail part, overhead rail type firefighting inspection robots, fire extinction equipment, a position identification block, a charging position, a remote control center and wireless signal transmission equipment. Each overhead rail type firefighting inspection robot comprises a traveling part, a lifting vision device, a position detection device, a detector, a fire extinction control device and a control and communication device. The robots move on a rail of the overhead rail part. The position detection devices conduct positioning by identifying the position identification block. The robots can be charged at the charging position. The fire extinction control devices operate the fire extinction equipment. The control and communication devices achieve communication of the robots and the remote control center through the wireless signal transmission equipment. The robots of the overhead rail type firefighting inspection robot system can conduct inspection detection along the rail, find out equipment failures and potential safety hazards and can conduct fire extinction operation in time.