The invention provides a miniature antenna applied to the 5G mobile communication. The miniature antenna comprises a grounding plate 101, a feed probe 102, a first radiation unit 103, a second radiation unit 107 and a third radiation unit 111. The three radiation units are located on the three surfaces of a cube respectively. A first groove 104 and a second groove 105 are formed in the first radiation unit 103. A third groove 108 and a fourth groove 109 are formed in the second radiation unit 107. A fifth groove 112 and a sixth groove 113 are formed in the third radiation unit 111. The first radiation unit 103 and the third radiation unit 111 are connected at a vertical edge. The second groove 105 and the fifth groove 112 are connected. The second radiation unit 107 and the third radiationunit 111 are connected, and an eighth groove 110 is formed between the second radiation unit 107 and the third radiation unit 111. A seventh groove 106 is formed between the first radiation unit 103and the second radiation unit 107. The seventh groove 106 and the eighth groove 110 are connected to form an E-shaped structure, a dipole pair and a groove-type antenna. In this way, the multi-frequency resonance is achieved. The communication requirements of multi-frequency and broadband during the 5G communication process are met. By adopting a three-dimensional structure, the section of the antenna is reduced, and the antenna can be integrated in a mobile terminal.