The object of this thesis is to design a track robot that can be used to clean the small air duct. The mechanism of this robot can be divided into two parts. They are chassis and body. The cleaning device is two brushes. The research work includes the design of overall structure, cleaning system, and the mechanism of image acquisition. The design of overall structure contains optimal design, choice of structure material and chassis body design. Two motor-driven brushes are used in this cleaning system. The mechanism of image acquisition is a design of clamping device with camera (WebCame). The mechanism of image acquisition is fixed on the body. The experimental results show that the air duct cleaning robot has the ability of remote control, rotation in place, going through the obstacles, image transmission.