Most of the Defense organization now takes the help of robots to carry out many risky jobs that cannot be done by the soldier. These robots used in Defense are usually employed with the integrated system, including video screens, sensors, gripper and cameras. The Defense robots also have different shapes according to the purposes of each robot. Here the new system is proposed with the help of low power Zig-bee wireless sensor network to trace out the intruders (unknown persons) and the robot will be employed with integrated systems, including video camera, sensors, gripper and a weapon. Thus the proposed system, an Multi-functional defense Robot using Zig-bee saves human live and reduces manual error in defense side. This is specially designed robotic system to save human life and protect the country from enemies.