Soybean protein-celery composite paper was prepared by spray coating soybean protein on celery paper. The mechanical properties and hot sealing performance of the composite paper was studied. The results showed that the compound of soybean protein suspension and celery paper makes performance difference of each 〖JP2〗part of the paper decrease, which obviously improves the uniformity of its mechanical properties; hot sealing of celery paper was realized, with the maximum average heat seal strength of 160.560 N/m.