The present invention discloses a target tracking method. The method is implemented in a mobile device having the photographing function. The method comprises the steps of according to a user input, determining a target position within an initial frame, wherein the target position represents a target frame around the center of a target; based on the target position within the initial frame, training and generating a tracker and a detector, wherein the tracker is adapted to track the target in a photographed video in the frame-by-frame manner, and the detector is adapted to conduct the frame-by-frame detection for the target in the photographed video; for each subsequent image frame of the photographed video, tracking by the tracker to obtain the target position of the image frame and outputting a tracking response value; judging whether the tracking response value is greater than or equal to a threshold or not; if yes, continuing the target tracking for the next image frame; if not, starting the detector and outputting the target position of the corresponding image frame by the detector; keeping the detector to run continuously for a predetermined number of frames; and switching to the a tracker for continuously conducting the target tracking. The invention also discloses a corresponding mobile device.