Oil shale in situ oil extraction method

The invention relates to an oil shale in situ oil extraction method comprising the following steps: 1, drilling at least two wells in an oil shale zone, wherein one well is an auxiliary well, the other well is an extraction well, and the auxiliary well vertically penetrates the oil shale; 2, using the auxiliary well to crack the top and bottom of the oil shale, thus forming a horizontal crack zone on the top and bottom of the oil shale so as to cover the extraction well; 3, using the auxiliary well to heat the oil shale up to a pyrolysis temperature so as to generate oil gas, and using the extraction well to extract the oil gas. The oil shale in situ oil extraction method can heat up the oil shale with high efficiency, thus improving oil shale in situ oil extraction efficiency.