The invention provides a sewer line cleaning robot. The sewer line cleaning robot comprises a cylinder, two rudders, two baffles, two first electric cylinders, an annular rack, three stirring devices,a tailstock frame, four jet tail bases, three first stepping motors, three motor bases, three gears, three second stepping motors, a water inlet pipe, an air suction pump, a dirt storage tank and a water outlet pipe. The sewer line cleaning robot is characterized in that each rudder is mounted at each of two sides of the middle position of the outer side of the cylinder, an opening is formed in the middle position of the other side of the cylinder, each baffle is mounted at each of the left and right ends of the opening, the rear end parts of the two first electric cylinders are respectivelymounted on the cylinder, the front end parts of the two first electric cylinders are respectively hinged to hinge supports arranged on the two baffles, and the telescoping of the first electric cylinders drives the opening and closing of the baffles. For the sewer line cleaning robot, the three stirring devices are arranged, so that the dirt blocking the sewer line is dredged, and the working modeis simple and efficient.