Abstract: Four different chemical types of camphor leaves essential oils were extracted by steam distillation and analyzed by gas chromatography-mass spectrometry to compare their compositional differences. The antioxidant activity of camphora leaves essential oil was evaluated by DPPH, ABTS and FRAP, and butylated hydroxyl anisole (BHA) was used as positive control. The results showed that 46 kinds of main chemical components were detected in four chemical types of camphor oils. Among them, 35 kinds of chemical components were detected in the isonerolidol type oil, and the main component was isonerolidol, which was 29.48%. A total of 33 chemical components were detected in linalool type oil, and the main component was linalool, which was 71.91%. A total of 33 chemical components were detected in camphor type oil, and the main component was camphor, which was 46.28%. A total of 33 chemical components were detected in cineol type oil, and the main components was 1, 8-cineole, which was 30.31%. The four chemical types of camphora oils all exhibited a certain scavenging effects on DPPH radical, ABTS radical and reducing power in a concentration-dependent manner. But their antioxidant capacity was lower than BHA.Among them, camphor type oil exhibited the strongest of DPPH and scavenging ability and Fe³⁺ reducing power. When the concentration was 8 g/L, the DPPH radical scavenging rate of camphor type oil was 30.34%±1.25%, FRAP value was (1.44±0.13) mmol/L. isonerolidol type oil showed the strongest ABTS radical scavenging ability. When the concentration was 8 g/L, the ABTS radical scavenging rate of isonerolidol type oil was 14.93%±2.32%.