The invention discloses a control method and system for adapting the position of a reach stacker cab to lifting boom angular variations. The control method comprises the steps that the angle theta of a reach stacker lifting boom is detected, an operating handle for controlling the lifting boom is operated, and a telescopic valve for amplitude variation of the lifting boom is controlled, so that the angle of the lifting boom is changed; and when the angle of the lifting boom is the minimum value of 0 degree, a cab moving oil cylinder stretches by the maximum value Lmax correspondingly, and when the angle of the lifting boom is the maximum value of thetamax, the cab moving oil cylinder stretches by the minimum value correspondingly, so that the position of the cab adapts to the lifting boom angular variations automatically. According to the control method and system provided by the invention, the minimum field angle of an operator can be increased, the visual range is shortened, and container hoisting paired lock operation is more convenient; and the automation degree of operation is increased, and manpower is saved.