Civil air defense door locking device

The utility model relates to the technical field of civil air defense door accessories, in particular to a civil air defense door locking device which comprises a civil air defense door body and two sets of end limiting sleeve columns which are symmetrical to each other and fixedly installed on an external wall, and the civil air defense door body is located between the two sets of end limiting sleeve columns. A threaded sleeve is fixedly installed at the center position of the front side face of the civil air defense door body, a double-channel locking device used for being inserted into the end limiting sleeve column for locking and limiting is arranged in the civil air defense door body, and a rectangular inserting hole communicated with the outside is formed in the end limiting sleeve column. The double-channel locking device comprises a first gear used for transmission and a second gear meshed with the first gear, and the first gear and the second gear are rotationally connected with the front side plate