Connecting device for TEM wave transmission line

The invention provides a connecting device for a TEM wave transmission line. The connecting device comprises a mounting body, a connecting nut; an outer conductor inserted into a second through portion, and a fastener, wherein the outer side wall of the outer conductor is provided with a fastening structure; and the fastener is matched with the fastening structure to be clamped on the outer side wall of the outer conductor. The connecting nut includes a matching structure for forming a fixed assembly with the fastening structure and the fastener. The connecting device for the TEM wave transmission line forms the fixed assembly through the matching structure of the connecting nut, the fastening structure of the outer conductor and the fastener, the product assembly speed is quick, the production efficiency and the qualification rate are improved, the installation consistency is good, and the connecting nut and the outer conductor are in fastening connection, so that the connecting nut and the outer conductor a