The utility model discloses a transmission line is column foot video inspection device under water, including sealed chamber, the camera, the lamp, insulating bar, worm gear mechanism one, a battery, the video transmitter, emit antenna, the inside through hole that is provided with of insulating bar, the camera, the light source, worm gear mechanism no. 1 sets up at sealed intracavity, the video transmitter, emit antenna sets up on the insulator spindle, insulating bar links to each other with sealed chamber, the camera is fixed on the worm -wheel shaft of worm gear mechanism no. 1, the camera passes through the cable with the video transmitter and links to each other, the video transmitter links to each other with the antenna. The utility model discloses simple structure, it is with low costs, through the control camera turn right or left of worm gear mechanism, can the 360 ground column foot situation under water of making an inspection tour, and then send video signal hypersystem such as cell -phone, computer through video transmitter, emit antenna and observe the storage.