The invention discloses a novel method for classified extraction and proportion calibration of crude oil in different occurrence states in tight sandstones. According to the method, in combination with a temperature and pressure fluid co-controller, crude oil in a free state, a closed state, a physical adsorption state and a chemical adsorption state in the tight sandstones, carbonate sealants and feldspar quartz is subjected to classified extraction, and according to the crude oil in different phase states, the light hydrocarbon loss degree difference is subjected to accurate correction and content ratio calibration. The method effectively combines static observation with dynamic extraction, and by virtue of visual observation and control of temperature and pressure conditions, the extraction content of each type of the crude oil is enabled to be accurate, the free-state crude oil and closed-state crude oil are separated for the first time in combination with actual geological conditions of oil layers, and the crude oil in the physical adsorption state and the crude oil in the chemical adsorption state are subjected to accurate extraction and content calibration for the first time. For accurate extraction of the crude oil in different occurrence states in the tight sandstones, the method ensures the reliability of subsequent geochemical parameter analysis.