Dehulling machine for camellia oleosa seed with a dehulling principle of extrusion and mill and a separating principle of sifting and wind was designed and manufactured. The water content and linear velocity of roller are the most significant factors affecting the results of dehulling and separating camellia oleosa seed. The fitting dehulling conditions are confirmed: water content 5%～20%, linear velocity of roller 8.90～10.00 m/s. Under the conditions mentioned above, dehulling rate is more than 98.5%, the content of kernels contained in hull is less than 4%, the content of hulls contained in kernel is less than 1%. The dehulling machine was put to use successfully. Camellia oleosa seed oil and dehulling camellia oleosa seed cake with high quality were obtained, which increased processing value of camellia oleosa seed.