The present invention provides a method and a device for evaporating and extracting sap components from a plant, and an extract thereof. Compared to hot water extraction or distillation extraction, evaporation extraction is performed at a low temperature, so the denaturing of phytochemical is prevented. Through evaporation extraction, plant-containing moisture and fragrant components including volatile material of a plant can be extracted, and an external liquid is not mixed as a solvent. Thus, even when a separate crude oil process is excluded, high purity crude oil extraction is possible. In an evaporation extraction process, the inside of an evaporation chamber is filled with inert gas, and various minerals and electrolytes contained in plant moisture can also be extracted without being destroyed, reduced, or changed. The method of the present invention comprises: a washing and dehydrating step of removing contaminants and bacteria of a processed plant selected to perform evaporation extract so as to extract phytochemical from the process plant a preparing step of crushing or pulverizing the plant into a size capable of being easily extracted, and thinly spreading the same on an evaporation box a sealing step of putting the evaporation box having the plant speared thereon in an evaporation extraction device shelf to be loaded in multiple layers, and sealing the evaporation chamber from external air a vacuum state forming step of forcibly discharging air in the sealed evaporation extraction device by a vacuum pump, and reducing an oxygen concentration in the device an evaporation hot air supplying step of diffusing and supplying hot air to the plant loaded on the shelf in the vacuum-state evaporation extraction device by means of an electrical heater and a circulating fan an evaporation moisture condensing step of evaporating moisture of the plant by the evaporation hot air, and collecting, cooling, and condensing the evaporated moisture and a collecting step of c
