Aiming at the requirements of the high-performance low-density 5056 aluminum honeycomb core for solar wing substrate， the preparation of domestic 5056 ultra-thin aluminum foil and corresponding anodized surface treatment was carried out，the preparation and performance evalution of domestic 5056 aluminum honeycomb was carried out. The nominal density of domestic 5056 aluminum honeycomb core is 17.28 kg/m³， and the joint strength is 1.87 kN/m. The bare compression， plane compression， L-direction and W-direction shear strength of honeycomb core reach 0.29， 0.31， 0.38 and 0.27 MPa， respectively. The mechanical properties are equivalent to the test values of imported honeycomb core. The hot-breaking process performance of honeycomb core rubber film is good， the nodes of grid sandwich structure are not disconnected， and the bending stiffness and strength are equivalent to the test values of imported honeycomb， which can meet the use requirements. The test results can provide data and technical basis for the subsequent spacecraft application of high-performance low-density aluminum honeycomb core and the domestic independent guarantee of raw materials.