In order to develop safe and efficient extractant and meet the requirement of safety production in oilfield，the feasibility of extracting oil-based drill cuttings by using hydrophobic deep eutectic solvent（DES）was investigated. Firstly，the hydrogen bond donor and hydrogen bond acceptor of DES were studied by stirring extraction. Then，taking the oil content of extracted drilling cuttings as the indicator，the processes of stirring extraction，ultrasonic extraction and microwave extraction were optimized. The experiment results showed that the best DES was the combination of lauric acid and thymol with the molar ratio of 0.8∶1. Among the three extraction processes，the ultrasonic extraction process was relatively mild. The oil content of the extracted cuttings could be reduced to less than 1%. The specific process was recommended as follows：6∶1 the mass ratio of DES and oil-based drill cuttings，30 min ultrasonic extraction time，and 40 ℃ extraction temperature. Under this condition，the oil content of cuttings could be reduced to 0.88%.