A new bioelastomer was synthesized by one-pot melt polycondensation. Chitin nanocrystal as emulsifier to stabilize pre-polymer and form Pickering emulsion. An eco-friendly emulsion casting process was used to prepare chitin nanocrystal reinforced nanocomposite elastomers. Filler-well-dispersed nanocomposite elastomers exhibited ultra-strong mechanical properties.