A cable TV coaxial video and network transmitter includes: a top cover having plural signal transmitting ports at peripheral positions thereof; plural connection guiding seats, wherein the bottom surfaces thereof are respectively protruded with a conductive pin; a bottom cover, combined with the top cover, and the interior thereof is installed with a printed circuit board; and plural insertion seats, fastened on the printed circuit board corresponding to the conductive pins, wherein one side of each of the insertion seats is formed with at least one connection leg, and the other side thereof is formed with an elastic clipping end having the interior formed with a pair of clamping segments, the contact length and the contact area between the pair of clamping segments and each of the conductive pins can be determined according to the dimension of the pair of clamping segments.