The present invention relates to an ultra-wideband printed antenna, arranged on a substrate and comprising: main body, signal transmission line and at least a first earthing part, where the main body is used to transmit-receive electromagnetic wave signal and comprises a first radiation part, a second radiation part and a plurality of convex parts. The two radiation parts are interconnected and parallel with each other, and a gap is arranged between the first radiation part and the second radiation part; the plurality of convex parts are symmetrically arranged on the first radiation part and the second radiation part, and extend toward the gap from the first radiation part and the second radiation part; the signal transmission line is connected with the main body to feed electromagnetic wave signal into the main body; and the first earthing part is arranged on one side of the signal transmission line. On the premise of not influencing performance, it can effectively reduce the occupied area.