The invention discloses a control method and a control system for a working device and engineering machinery for traction work. The control method for the working device comprises the steps: obtaining a turbine torsion and an engine torsion; calculating to acquire a torque ratio; if the torque ratio is within a preset torque ratio scope, maintaining the position of the current working device; when the torque ratio is more than the maximal torque ratio within the preset torque ratio scope, lifting the working device until obtaining a torque ratio which is not more than the maximal torque ratio; and when the torque ratio is less than the minimal torque ratio within the preset torque ratio scope, descending the working device until obtaining a torque ratio which is not less than the minimal torque ratio. According to the control method for the working device, the current operation condition of the working device is determined by the ratio of the turbine torsion to the engine torsion so as to control the lifting of the working device, improve the working efficiency and operation quality of the engineering machinery and reduce labor intensity of drivers.