The invention relates to a method for extracting and purifying grape seed oil from grape seeds. The method comprises the following steps of (1) smashing the grape seeds to obtain grape seed powder; (2) leaching the grape seed powder by using petroleum ether and filtering to obtain a seed oil crude extract; (3) adding activated clay into the crude extract, continuously stirring and standing to obtain a decolorized crude extract; (4) carrying out vacuum concentration on the decolorized crude extract till the petroleum ether is completely removed to obtain crude oil; (5) adding a NaOH solution into the crude oil, carrying out vacuum pumping, adding activated clay to decolorize the mixture, and carrying out centrifugal separation to respectively obtain lower-layer activated clay and upper-layer clear liquid, wherein the upper-layer clear liquid is decolorized crude oil; (6) processing the decolorized crude oil by using an activated carbon column to obtain essential oil A; (7) adding the petroleum ether into the lower-layer activated clay, carrying out vacuum filtration and vacuum concentration to obtain recovered oil, carrying out vacuum pumping on the recovered oil and processing the recovered oil by using an activated carbon column to obtain essential oil B; and (8) combining the essential oil A and the essential oil B to obtain the end product. The method disclosed by the invention is little in investment, simple in process and low in environmental pollution and is suitable for industrial production.