A micro robot for inspecting the inside of a pipe is provided to smoothly operate the moving robot in the pipe and improve the removal efficiency of the scale and the impurities by the forward and reverse rotation of the brush drill mounted with the brush. A micro robot for inspecting the inside of a pipe is composed of a center shaft(9) of a moving robot; and plural wheels(2,3,4,5) installed on the outer perimeter of the center shaft with a regular gap through a buffer device. The center shaft is installed with a drill and a motor for operating the drill. The center shaft is mounted with an ultrasonic prove and an injection device. Combining units contain first and second robots. A circular connection part controlling frame is operated between the combining units by rotation of the steering motor.
