The invention provides a robot for repairing building cracks. The robot comprises a control table, a driving motor, a base and a storage bin, the control table is arranged above the base, control switches are installed on the surface of the control table through bolts, doors are installed on the surface of the control table through hinges, handles are installed on the surfaces of the doors throughbolts, an electric lifting pillar is installed on the part, on one side of the control table, of the base through bolts, a rotating motor is installed at the output end of the electric lifting pillarthrough a fixing block, and a fixed base is installed at the output end of the rotating motor through a rotary shaft. By arranging a series of structures, when being used, the robot for repairing thebuilding cracks has the advantages of saving more labor and material resources, being high the automation degree and higher in safety, and having few failure problems.