The cotyledons of Toona sinensis are elliptic, 15 to 17 millimeters long and 5 to 7 millimeters wide. Primary leaves opposite, composed of 3 leaflets pinnately compound, terminal leaflet rhombic, lateral leaflets ovate, leaf margin serrate, the 4th to 6th true leaves are odd pinnately compound, composed of 3 to 7 leaflets, and later increase 1 pair of leaflets every 2 to 3 compound leaves. Adult leaves are alternate, mostly even-numbered pinnately compound, with 8 to 14 pairs of leaflets, opposite or subopposite.

Complex leaf petiole red, shallowly grooved, hypertrophied at the base, leaf scars large, obcordate or obtriangular, with fiber tube bundles. Leaflets lanceolate, base rounded, apical acuminate, 6,0-9,0 cm long, 1,5-5,0 cm wide, leaf margin serrate, petiole 0. 1-0. 7 cm long. Young leaves are reddish-red, adult leaves are green.