The invention discloses a full-automatic starting system for a sintering waste heat recycling and sintering draught fan combined unit. The full-automatic starting system comprises a double-output-shaft sintering draught fan, a motor, a variable-speed clutch, a steam turbine, an inlet pressure transmitter, a fast closing valve, a rotating speed sensor, a rotating speed PID controller and a pressure PID controller. A full-automatic starting method includes the steps that firstly, the sintering draught fan is started; secondly, after the sintering draught fan runs normally, pressure of inlet steam of the steam turbine is detected; and thirdly, the steam turbine is started, a PLC system controls the opening degree of a main throttle valve so as to control the rotating speed of the unit till the inlet steam of the steam turbine reaches a proper condition. The full-automatic starting system and method achieve full-automatic one-button starting of the whole unit, the safety in the unit starting process is guaranteed, the starting time of the whole unit is greatly shortened and is shortened from 120 min to 90 min, and mistaken operation and possible losses in the operating process of manual unit starting are avoided. Meanwhile, conditions are provided for enterprises to save the labor cost, and generated direct and indirect economic benefits are great.