The invention relates to a compact unfolding and folding device for an airborne
radar large-array-plane antenna, and the device comprises a frame, a
synchronizing shaft, a transmission rod and a driving device, wherein the driving device and the frame are arranged on a base, and the
synchronizing shaft is arranged on the frame and can rotate relative to the frame; the transmission rod is in vertical transmission connection with the
synchronizing shaft, the synchronizing shaft is connected with an
antenna array plane, and the driving end of the driving device drives the transmission rod to movein the axial direction and drives the synchronizing shaft to rotate so as to unfold and fold the
antenna array plane. The transmission rod is driven by the driving device to move in the axial direction, and then the synchronizing shaft is driven to rotate to achieve unfolding and folding of the
antenna array plane, and enabling the antenna array plane to be attached to a belly of an
airplane to the maximum extent. Moreover, the device is low in cost, is simple in motion, is high in reliability, is high in
automation degree, and can meet the requirements of unfolding and folding work of the airborne large-array-plane antenna.