The invention provides a tilting control system of a converter, comprising the converter, a motor, an angle detector, a blow valve and an emptying valve, an ash damper and a fire damper door motor, an oxygen control valve and a controller. The controller is in charge of tilting control on the converter, the oxygen control valve is closed after the tilting operation is started; the ash damper and a fire damper door are opened after the converter rotates over a first angle, and the converter is controlled to rotate to a second angle; the converter is controlled to rotate to a third angle after a sealed gas hood trolley is judged to be hoisted to a middle limit, and the blow valve is closed and the emptying valve is opened when the converter is at the third angle; and then the converter is controlled to rotate to a fourth angle, and the converter is controlled to rotate to a fifth angle after the sealed gas hood trolley is hoisted to an upper limit. In the embodiment in the invention, the safety and reliability of the traditional converter operation can be improved, the automation level of the converter operation is improved, the labour intensity of an operator is reduced, and air hole blockage caused by misoperation also can be effectively avoided.