The application discloses underground works bow member vertical fixing connecting device, including bow member splice bar and limiting fixing device, its characterized in that: the bow member splice bar is used for along longitudinal tie two adjacent bow members, its connecting portion that include the weld part that is located both ends and be located the centre, the weld part for with the outerterminal surface fixed connection on the bow member edge of a wing, limiting fixing device includes spacing connecting portion and limiting main body portion, spacing connecting portion are the edge of part at least the outside and the bow member splice bar fixed connection of connecting portion cross section, limiting main body portion with the one end of spacing connecting portion is connected,for with the one side on the bow member edge of a wing contacts.