A semi-rigid solar battery wing of a spacecraft comprises a root unfolding locking mechanism, an interpolate unfolding locking mechanism, a connection frame, an inner semi-rigid battery plate, a middle inner semi-rigid battery plate, a middle outer semi-rigid battery plate, an outer semi-rigid battery plate, an unfolding synchronization device and a compressing release mechanism, wherein the root unfolding locking mechanism is connected with the spacecraft, the connection frame is connected with the root unfolding locking mechanism and the interpolate unfolding locking mechanism, the inner semi-rigid battery plate, the middle inner semi-rigid battery plate, the middle outer semi-rigid battery plate and the outer semi-rigid battery plate are movably connected sequentially, the inner semi-rigid battery plate is connected with the connection frame through the interpolate unfolding locking mechanism, the unfolding synchronization device is arranged on the middle inner semi-rigid battery plate, and the compressing release mechanism is arranged on the outer semi-rigid battery plate. By means of the technical scheme, a short circuit is avoided, and electricity generation efficiency of the solar battery wing is improved.