With the development of flexible electronic devices, there is increasing requirement for the inexpensiveand environmental-friendly substrates. Cellulose paper has gained great attention because of its abun-dance, biodegradability and renewability. In this paper, we designed a hybrid nanopaper by introducingnative cellulose nanofibrils (CNFs) into cellulose nanowhiskers (CNWs) matrix, which achieved a highoptical transmittance while retaining iridescence under polarizing film. This nanopaper is less expensivethan neat CNFs-based nanopaper and more feasible for large-scale production. Besides, our transparenthybrid nanopaper possesses the writable surface like regular paper. Compared with commercial paper,however, hybrid nanopaper shows superior optical properties and low surface roughness. The combi-nation of these characteristics makes this nanopaper an excellent candidate for substrates of flexibleelectronic devices.