A new Active Disturbance-rejection Controller(ADRC) based on a current loop was proposed to improve the isolation degree of disturbance for an aerial photoelectrical stabilized platform. First, the structure diagram of a dc torque motor was simplified to a first-order model by the current loop to avoid the influence of noise from the parameters on disturbance observation values. And then, based on bandwidth parameterization, an extended state observer and the control law with disturbance compensation were designed. Finally, an experiment was performed to test the disturbance rejection performance of the ADRC at the speed disturbance from 0.1 Hz to 2.5 Hz and to compare with the traditional square lag-lead compensation method. Experiment results show that the ADRC can reduce the disturbance error by 6.56 dB at least. The isolation degree of disturbance is improved obviously when the perturbation frequency is more than 0.5 Hz, and the best isolation degree of disturbance is increased by 12.03 dB. Moreover, the ADRC have strong robustness, allowing the range of system parameters to change in 15%. In conclusion, the ADRC based on current loop satisfies the performance requirements of aerial photoelectrical stabilized platforms and has higher practical values.