A communication antenna for a mobile terminal with a metal frame, the antenna comprising the metal frame, a first passive unit, a stimulation receiving unit and a second passive unit, wherein the first passive unit and the second passive unit are configured to be coupled to ground respectively, the stimulation receiving unit is configured to be electrically coupled to a radio frequency module of the mobile terminal so as to receive an electrical signal transmitted by the radio frequency module; the first passive unit comprises a regulating circuit, the regulating circuit comprises a switch, a controller and a regulating assembly, the regulating assembly comprises a plurality of electronic components, and the controller is configured to control the switch to connect different electronic components of the regulating assembly to the circuit, so as to make the communication antenna to resonate in different frequency ranges, wherein the first passive unit further comprises a first antenna pattern, a first grounding node is disposed on the first antenna pattern, the first antenna pattern is electrically coupled to a first terminal of the regulating circuit via the first grounding node, a second terminal of the regulating circuit is configured to be coupled to ground; the stimulation receiving unit comprises a second antenna pattern and a first matching circuit, a feeding node is disposed on the second antenna pattern, the second antenna pattern is electrically coupled to a first terminal of the first matching circuit via the feeding node, a second terminal of the first matching circuit is coupled to the radio frequency module; the second passive unit comprises a third antenna pattern and a second matching circuit, a second grounding node is disposed on the third antenna pattern, the third antenna pattern is electrically coupled to a first terminal of the second matching circuit via the second grounding node, a second terminal of the second matching circuit is configured to be coupled to ground, wherein the feeding node is located between the first grounding node and the second grounding node; a first break gap and a second break gap are formed at a same side of the metal frame, the first antenna pattern, the second antenna pattern and the third antenna pattern are disposed around the first break gap, and the first antenna pattern and the second antenna pattern are electrically coupled to a part of the metal frame between the first break gap and the second break gap respectively, wherein the second antenna pattern comprises a connecting portion, a feeding portion, a first parasitic branch and a second parasitic branch, parts of the metal frame at two sides of the first break gap are electrically coupled by the connecting portion, and the feeding node is disposed on the feeding portion, the first parasitic branch is extended from the connecting portion in a first direction, the second parasitic branch is extended from the feeding portion in a second direction, the first parasitic branch is electrically coupled to the feeding portion, in which the first direction is a direction from the first break gap to the second break gap, and the second direction is a direction perpendicular to the first direction and pointing to the metal frame.