The invention relates to a poria cocos composite substitutional tea and a making method thereof, which belong to the fields of medicine and health caring. The poria cocos composite substitutional teasolves the technical problem of unobvious fat-reducing effect and expensive price of the current slim tea. The poria cocos composite substitutional tea is prepared by poria cocos, licorice, sea-buckthorn, polyghace seche, perilla, mulberry leaf, Chinese yam, wolfberry, root of kudzu vine, seed of Chinese waxgourd, cassia seed, mint, raspberry, hawthorn, chicory, cape jasmine and purslane. The method comprises the following steps: raw materials are respectively subjected to careful selection, impurity removal, pesticide residue removal, fertilizer residue removal and drying in order, and then the raw materials are mixed; a step of pesticide residue removal is characterized in that water, sodium bicarbonate and a Liby kumquat dishwashing liquid are used for preparing mixed liquor for immersion; and a step of fertilizer residue removal is characterized in that an ozone aqueous solution is used for immersion. The poria cocos composite substitutional tea can inhibit the generation of serumcholesterol and triglyceride acid in human body.