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A propeller load balancing device is taken as the research object to achieve the goal of the orientation control and load balancing of the device by controlling the position angle of pitch and deflection .Based on the strong coupling characteristics of the system,the location control is combined with the system decoupling realized through the state feedback strategy to realize the precise control of the orientation and pitching Angle of the device.At the same time, in order to cope with the influence of the load disturbance on the device's position and posture, a disturbance observer is designed to observe the external interference in real time and the way of feedforward compensation is used to improve the response of the device for interference suppression.Through the research of system dynamic model, decoupling design, position control design, perturbation observer design and feedforward interference suppression compensation design based on the observation output, this paper realizes the disturbance suppression and attitude control when the external load is abrupt.The results show that the disturbance rejection ability can be enhanced by introducing the adjusted controller with Interference observer and feedforward compensation. It has great engineering application value for the stability improvement of the platform.