The invention relates to a novel selenium-rich tea cultivation method capable of preventing pest and disease disasters, in particular to a method for interplanting of osmunda japonica thunb, tea trees and Chinese fir trees in hillside forest land. The method specifically comprises the steps that the hillside forest land is improved through improved soil rich in organic selenium, the tea trees are planted, organic selenium fertilizer is applied, and interplanting of the Chinese fir trees and ryegrass is conducted. A fence is formed by the Chinese fir trees on the outer side of a ditch, large tea tree seedlings are planted on the inner side of the fence, and the tea trees prefer the shade places, and can well grow; due to interplanting of multiple crops, the whole economic benefit is improved.