The present invention discloses a multi-device motion trajectory updating and tracking method, a multi-device motion trajectory updating and tracking system and a mobile terminal. The multi-device motion trajectory updating and tracking method includes the following steps that: at least two mobile devices form a communication group through using a communication application; the location information of each mobile device is acquired regularly or irregularly, so that the location information of each mobile device can be shared among members in the communication group; one member is selected from the communication group through the location information so as to be adopted as a following target; and the traveling trajectory of the following target is shared among the members in the communication group. With the above multi-device motion trajectory updating and tracking method adopted, the traveling trajectory of the following target can be shared among the members in the communication group, a traveling route can be effectively corrected, and multi-device team formation traveling can be maintained.