This invention relates to an oxidation technique of cyclohexane liquid. In this method, cyclohexane liquid and its oxidation products go through the reaction region in the form of laminar flow; oxygen-containing gas goes through the reactor where it is mixed with cyclohexane liquid and goes through the reaction region together in the form of parallel flow. This technique helps promote the recycling ratio of alcohols and ketones, and as no stir is necessary, facility investment and operation cost can be greatly cut down. In this method, total conversion efficiency of cyclohexane is 5.0~5.5% and total selectivity between cyclohexanol and cyclohexanone is not less than 85%.