The invention relates to a manufacturing method of water lily internal heat-reduction syrup. The water lily internal heat-reduction syrup is prepared from water lily flower, water lily leaf, lotus stamen, lotus plumule, green tea, honeysuckle flower, xylitol, honey and Laoshan mineral water as main raw materials by special processes. Water lily flower, water lily leaf, water lily stamen, lotus plumule, green tea and honeysuckle flower are ground to form powder, the powder is decocted to form extract, and the extract, decocted xylitol syrup and honey are mixed to obtain a uniform mixture. Water lily flower has mild properties, has a bitter and sweet taste, and has effects of invigorating blood circulation and stopping bleeding, dispersing blood stasis and relieving pain, dispelling wind-evil and clearing damp, clearing heart and cooling blood, invigorating spleen and astringing intestine to stop diarrhea, and promoting the production of body fluid to quench thirst. Water lily leaf has effects of relieving fever, clearing summer-heat, refreshing one's mind, dispersing blood stasis, stopping bleeding, inhibiting bacteria, relieving spasm and removing damp. Lotus plumule has effects of clearing heat, controlling nocturnal emission, calming nerves and strengthening heart. The water lily internal heat-reduction syrup combines effects of the multiple Chinese herbal medicines with heat-clearing and internal heat-reduction activity, is a pure natural Chinese herbal medicine, has good effects of clearing inner heat, can be eaten simply, has a good taste, and is suitable for people suffering from inflammation and heatstroke.