The utility model discloses a fixing device, including two at least slidable ground be fixed in shaft tower mount on the shaft tower, and at least one link that the cooperation of shaft tower mount is connected, and with the fixed?establishment that the link cooperation is connected, fixed?establishment include energy supply piece mount and set up in energy supply piece on the energy supply piece mount. Through the sliding connection structure of shaft tower mount and shaft tower can realize the installation of fixing device arbitrary height on the shaft tower, and the commonality is strong, and does not receive the restriction of shaft tower self structure, and this structure is installed and removed conveniently simultaneously, and the assembly steadiness is high.