The utility model discloses an object tracker which includes a tracking source and a mobile phone terminal. The tracking source includes a single-chip microcomputer, a power supply, a tracking source GPS positioning system, and a tracking source signal transceiver, wherein the power supply, the tracking source GPS positioning system, and the tracking source signal transceiver are respectively connected with the single-chip microcomputer; the tracking source GPS positioning system sends positioning data to the single-chip microcomputer; the single-chip microcomputer through the tracking source signal transceiver receives an instruction from the mobile phone terminal, and controls the tracking source signal transceiver to send the positioning data to the mobile phone terminal; the mobile phone terminal comprises a controller, a mobile phone terminal signal transceiver and a display; the tracking source signal transceiver and the mobile phone terminal signal transceiver carry out data transmission through a Zigbee network; the controller sends the instruction through the mobile phone terminal signal transceiver to the tracking source; the mobile phone terminal signal transceiver is used to receive the position data from the tracking source; and the positioning data is displayed on the display. The Zigbee network is selected to serve as the wireless transmission mode, the power consumption is quite low, and the object tracker is suitable for tracking keys and other important small objects.