The invention discloses a diesel-oil-based drilling cutting processing method based on solvent extracting, and particularly relates to a method for processing shale-gas diesel-oil-based drilling-fluid drilling cuttings. A solvent for processing shale-gas diesel-oil-based drilling cuttings is prepared from, by weight, 20-40 parts of normal hexane, 20-40 parts of acetone, 20-40 parts of methyl ethyl ketone, 10 parts of ethyl acetate and 10 parts of ethyl alcohol. According to the solvent, the crude oil recycling rate for diesel-oil-based drilling cuttings can be about 99.7%, and the optimal extracting conditions are that the solvent-to-mud ratio (volume unit (ml) : mass unit (g)) is 3:1, extracting temperature is 45 DEG C, the stirring speed is 500 r / min, extracting time is 20 min, and the water-washing-three-grade cross-flow extracting technology is adopted. After extracting is completed, the recycling rate of an extracting agent can be about 98.5%, and the prepared extracting agent has the advantages that the effect is good, the crude oil recycling rate is high, the recycling rate of the extracting agent is high, the technology is simple, cleaning and pollution-free effects are achieved, and cost is saved.