As durable as conventional plastics, the bioplastic is water-resistant and can be processed into sturdy sheets or pellets. Experiments show that minor scratches or cracks on its surface can repair themselves when a little water is added at room temperature, restoring the original molecular structure and load-bearing capacity without heating or chemical treatment. Minor surface scratches or cracks can be repaired at room temperature by adding a little water, which restores the original molecular structure and load-bearing capacity. The study thus provides a solution that accelerates plastic recycling, reduces carbon emissions, and minimises secondary environmental and human health impacts. Its molecular structure can also be precisely engineered at the nanoscale for micro-components in electronics or high-tech materials.