A packaging cushioning material includes a connecting section, and a first assembly section and a second assembly section integrally extended from the connecting section. The first assembly section includes at least one first groove, at least one first assembly portion and a first clamping portion connected to the first assembly portion. The second assembly section includes at least one second groove, at least one second assembly portion disposed along an extension line of the first assembly portion, and a second clamping portion connected to the second assembly portion. By locking and fastening a fastening member at an assembly region, or by bending the first assembly section and the second assembly section towards the connecting section, the first clamping portion and the second clamping portion form a locking and fastening means to allow the packaging cushioning material to form a multilayer structure providing reduced transportation and storage complications.