The present invention provides a super miniaturization digital signal receiving antenna mounted in the inside of the mobile device, including a baseboard, an antenna unit and a switch unit. The baseboard has a plate body, the plate body has a grounding metal surface and a first exposed surface, a second exposed surface which is on the same side with the grounding metal surface, has a metal microstrip line which is electrically connected with the switch output terminal, the input terminal of the switch unit is electrically connected with the multiple leads of the first exposed surface, the other ends of the multiple leads are electrically connected with the antenna unit. Finally, when switching the channels of the portable digital television, the signal of the switch channel is output to the switch unit, the switch unit switches to the frequency band range for properly receiving the digital signal by it self according to the frequency of the channel, to process digital signal receive.