This paper studies the problem of attitude control for spacecraft with parameter uncertainties and unknown external disturbance. A linear active disturbance rejection controller (LADRC) with three channels for attitude control for spacecraft is designed to actively compensate for the disturbance and improve the system robustness. Finally, the simulation results demonstrate that LADRC is effective for attitude control for spacecraft. By making the comparison between LADRC and traditional PD controller, better dynamic performance and higher control precision are obtained by using LADRC.