The invention discloses an oil tea and walnut interplanting method, and relates to the technical field of economic forestry planting. The planting process includes the first step of forest land selection, the second step of forest land preparation, the third step of the large-surface soil improvement, the fourth step of the small-surface soil improvement, the fifth step of interplanting planting, the sixth step of forest management, the seventh step of trimming and the eighth step of other management. The step of the large-surface soil improvement includes the substeps of firstly, mixing materials of a soil improvement agent; secondly, preparing the soil improvement agent; thirdly, using the soil improvement agent. The step of interplanting includes the substeps of firstly, selecting seedlings including large walnut seedlings and oil tea saplings; secondly, digging pits in the small surface; thirdly, digging pits in the large surface; fourthly, conducting transplanting, wherein the walnut seedlings and the oil tea saplings are transplanted. The step of forest management includes the substeps of firstly, conducting walnut young forest management, wherein thinning, spring beginning fertilizer applying and autumn and winter fertilizer applying are conducted; secondly, conducting oil tea young forest belt management, wherein spring fertilizer applying and autumn topdressing are conducted. The method has the advantages of being high in yield, good in product quality and the like, and is suitable for newly planted oil tea and walnuts in barren hills which have the gradient within 20 degrees and are suitable for afforestation.